II iiiiiiiiiiniiiiiiiiiiiiiiii iiiiiniiiiiiiiiimiiiiiii 


Ophthalmic  Lenses 

AND 

Accessories 


LENSES,  FRAMES,  MAGNIFIERS 
AND   READERS 


THE   EYE   AND   THE   LENS 


^ 


^ 


AN   OPTICAL   COMBINATION 


BAUSCH  h  LOME   OPTICAL  CO. 


ROCHESTER,  N.  Y 


III! I I I I I mill 


1916 

Copyright,  iWapby 


Bausch  &  Lomb  Optical  Co. 


BERXELEY^ 

LIDRARY 

UN!v'¥-'.'S(TY  OF 
CALlfORKIA 


DFIOMnRY  LIBRARY 


GROUP    OF    BUILDINGS    ON    ST.    PAUL    STREET    TRACT 

WORKS    OF 

BAUSCH   k   LQMB   OPTICAL  CO. 

ROCHESTER,  N.  Y. 
U.   S.  A. 


*^r^(W 


GROUP    OF    BUILDINGS    ON    RIVER    FLATS    TRACT 


BAUSCH  &  LOMB       />^^       OPTICAL  COMPANY 


DESCRIPTIVE 

THE  works  of  the  Bauscli  &  Lomb  Optical  Company  are  located  in  the 
City  of  Rochester,  State  of  New  York,  and  cover  on  the  St.  Paul  Street 
tract  a  floor  space  of  about  ten  acres,  with  additional  buildings  occupying 
a  land  area  of  about  nine  acres  on  the  river  flats.  The  former  buildings 
include  the  executive  offices  and  main  manufacturing  plant,  while  those  on 
the  latter  site  are  chiefly  devoted  to  the  moulding  of  optical  glass  into  suitable 
forms,  preparatory  to  grinding. 

The  buildings  themselves  are  designed  to  meet  all  requirements  for  the 
delicate  operations  involved  in  optical  and  mechanical  works  of  precision. 
The  rooms  are  large  and  airy,  well  lighted  and  heated  by  a  modern  blower 
system  with  a  water  cooling  device  which  insures  pure  air  of  proper  humidity. 
The  plant  is  also  provided  with  refrigerating  machinery,  and  all  machines 
and  buildings  are  exceptionally  well  safeguarded  for  the  protection  of  life 
and  property. 

The  equipment  for  the  manufacture  of  the  varied  lines  of  optical  instru- 
ments is  of  the  most  modern  types  known  to  mechanics.  Much  of  the  ma- 
chinery is  designed  and  constructed  by  our  own  experts  in  our  own  plant  and 
is  the  result  of  an  experience  of  more  than  sixty  years  of  optical  and  mechani- 
cal endeavor.  Owing  to  the  technical  character  of  the  industry,  all  devices 
undergo  constant  supervision  and  inspection  in  order  to  maintain  the  equip- 
ment at  its  highest  point  of  efficiency. 

The  organization  comprises  a  force  of  approximately  2,500  employees  thor- 
oughly trained  in  their  respective  branches.  From  the  computations  of  the 
Scientific  and  Technical  Bureaus,  through  to  the  intricate  mechanical  opera- 
tions, each  progressive  step  is  marked  by  a  systematic  control  until  the  product 
reaches  final  inspection,  when  our  trade  mark  guarantees  the  Bausch  &  Lomb 
standard  of  quality. 

In  addition  to  the  executive  offices  at  Rochester,  N.  Y.,  branch  offices  are 
maintained  and  other  representatives  established  in  different  large  com- 
mercial centers  to  provide  adequate  distribution  for  our  products,  not  only  in 
America  but  for  the  markets  of  England  and  her  colonies,  throuffhout  the 
continent  of  Europe  and  in  parts  of  Asia.  The  addresses  of  the  different 
branches  follow: 

New  York  :    200  Fifth  Avenue. 

Washington:    613  Fifteenth  Street,  N.  W. 

Chicago:    122  S.  Michigan  Boulevard. 

San  Francisco:    154  Sutter  Street. 

Frankfurt  a.  M.:    G.  M.  B.  H.  30  Schillcrstrasse. 

London:    37-38,  Hatton  Garden,  E.  C. 


BAUSCH  &  LOMB       /M5So»N       OPTICAL  COMPANY 


TABLE   OF  CONTENTS 

PAGE 

View  of  Works 3 

Description  of  Plant 4 

Introductory 7,  8 

Chronological  Review  of  Optics 9-13 

The  Theory  of  Lens  Action 14-24 

Optical  Glass 25-27 

Color  and  Absorption  Chart  (Insert) Opposite  26 

Flat  Optical  Glass  Blanks,  Sizes 28-30 

Prices 29-31 

Moulded  Optical  Glass  Blanks,  Sizes 32 

Prices 33 

Ophthalmic  Lens  Chart 34,  35 

A  Few  Facts  about  Vertex  Refraction,  with  Compensation  Table 36-38 

Ophthalmic  Lenses  (descriptive) 39-41 

Facsimile  Display  of  B.  &  L.  Lens  Labels 42 

Primex  and  Centex  Foci  and  Code - 43 

Punktal  and  Katral  Foci  and  Code 44 

Thickness  of  Uncut  Lenses 45 

Table  of  Minimum  Quantities 46,  47 

Prescription  Blank 48,  49 

Uncut  Lenses,  Sizes 50 

Uncut  Lenses,  Prices 51-68 

Piano 51-55 

Rough,  Flat  and  Meniscus 51-53 

Finished  on  Both  Sides 54,  55 

Piano  and  Double 56 

Periscopic 57 

Meniscus 58,59 

Cylinder  Lenses 60-66 

Flat  Rough 60 

Flat  Piano 61 

Flat  Sphero  and  Cross 62 

Toric  Rough 63,  64 

Toric  Piano 65 

Toric  Sphero 66 

Prisms,  Rough,  Piano,  Sphero  and  Cylinder 67,  68 

Euphos  Lenses,  Prices 69 

Crookes  Lenses,  Prices 70 

Noviol  Lenses,  Prices 71 

Auto  Goggle  Lenses,  Prices 72 

5 


BAUSCH  &  LOMB      /^^^      OPTICAL  COMPANY 


TABLE   OF  CONTENTS— Continued  p^^^, 

Primex  Lenses,  Prices  Uncut 73 

Prices,  Bevel  and  Rimless  Edging 74 

Punktal  Lenses  (descriptive) 75-77 

Prices,  Uncut  and  Edged 78,  79 

Katral  Lenses  (descriptive) 80 

Prices,  Uncut  and  Edged 81 

Miscellaneous  Lenses,  Prices 

Portex,  Coquille  and  Mi-Coquille 82 

Edging  and  Drilling,  Centex  and  Portex  (descriptive) 83 

Table  of  Standard  Sizes  of  Edged  Lenses 84 

Chart  of  Uncut  Sizes  for  Edging 85 

Illustrations  of  American  Standard  Sizes 86-91 

Bevel  and  Rimless  Edging,  Prices 92-110 

Piano  and  Sphero 92-99 

Cylinder,  Flat  and  Toric 100-107 

Prisms  and  Extras 110 

Drilling  White  Edged  Lenses,  Prices 108 

Drilling  Colored  Edged  Lenses,  Prices 109 

Bifocal  Lenses  (descriptive) Ill 

Split  and  Cement 112-115 

Kryptok  Blanks  and  Lenses 116, 117 

Kryptok  Chart 118,119 

Kryptok  Directions 120,  121 

Ultex  Onepiece  Blanks  and  Lenses 122, 123 

Ultex  Onepiece  Charts 124,  125 

Ultex  Table  of  Surfacing  Tools 126,127 

Ultex  Onepiece  Directions 128,  129 

Eyeglass  Frames,  Magnifiers  and  Readers  (descriptive) 130,  131 

Eyeglass  Frames  and  Material 132-135 

Monocle  Glasses 134,  135 

Folding  Magnifiers 136-138 

Hand  Magnifiers 138,  139 

Bank  Note  Detectors 139,  140 

Watchmakers'  and  Engravers'  Glasses 140,  141 

Reading  Glasses 142,  143 

Reading  Glasses,  Semi-Achromatic 144 

Reducing  Glasses      144 

Reading  Glass  Holder 145,  146 

Magnifier  Holders 145,  146 

Trade  Mark  Finder 145,  146 

Co-operative  Service 147 

Other  Publications 148 


B  A  U  S  C  H 


INTRODUCTORY 

SUBJECTIVE  and  ol)joc'tiv('  metliods  for  (Ictcrinining  errors  of  refraction 
require  not  only  skill  and  experience  on  the  part  of  the  oculist,  optome- 
trist and  optician,  hut  place  a  burden  of  responsibility  upon  the  manu- 
facturer of  the  apparatus  which  makes  the  precise  use  of  these  methods  pos- 
sible. Next  in  importance  to  apparatus  for  the  accurate  detection  of  errors  of 
vision  are  lenses  to  correct  those  defects. 

Ophthalmic  lenses  are  worthy  of  more  studied  treatment  by  the  producer 
than  can  be  accorded  them  in  an  ordinary  commercial  catalog.  The  outcome 
of  centuries  of  development,  involving  the  efforts  of  some  of  the  world's 
greatest  scientists,  they  constitute  a  subject,  historical  and  scientific,  of  espe- 
cially vital  interest  to  all  concerned  with  optical  activities. 

It  is  in  recognition  of  this  interest  that  this  catalog  has  been  prepared.  In 
the  hope  that  both  trade  and  profession  will  value  it  as  a  volume  of  reference, 
as  well  as  a  catalog,  we  dedicate  it  to  their  interests.  In  it  they  will  find 
many  of  the  facts  and  theories  of  yesterday  and  to-day,  collated  in  a  form 
more  logically  compact,  perhaps,  than  they  have  elsewhere  at  their  disposal. 

We  began  the  manufacture  of  lenses  with  the  foundation  of  the  Company 
in  1853.  Our  production  is  not  confined  to  ophthalmic  lenses  but  embraces 
all  known  types,  from  searchlight  reflectors  several  feet  in  diameter  to  lenses 
of  pin-head  size  used  in  microscope  objectives,  as  well  as  high-grade  photo- 
graphic lenses  and  intermediate  forms  of  every  sort.  Such  extensive  expe- 
rience has  naturally  given  us  considerable  prestige  in  the  scientific  world  as 
lens  manufacturers. 

With  the  co-operation  of  our  associates,  the  world  famous  optical  works  of 
Carl  Zeiss,  Jena,  we  have  been  enabled  to  add  to  the  list  of  modern  lenses 
two  new  types — the  Punktal  and  the  Katral — and  to  introduce  a  series  of 
instruments  for  ophthalmological  use,  all  of  which  are  made  to  conform  to 
the  most  exacting  requirements  and  represent  notable  achievements  of  Ameri- 
can and  European  ingenuity. 

In  this  catalog  we  describe,  illustrate  and  list  our  complete  line  of  ophthal- 
mic lenses,  which  we  believe  to  be  the  most  comprehensive  in  scope  of  the 
product  of  any  lens  manufacturer,  our  rubber  and  zylonite  eyeglass  frames, 
our  magnifiers  and  our  readers.  In  another  volume  will  appear  our  complete 
line  of  ophthalmic  instruments  and  optical  machinery. 

In  the  following  pages  will  also  be  found  descriptive  articles  on  optical 
glass,  the  historical  phase  of  optics  and  the  scientific  principles  underlying 
the  different  types  of  ophthalmic  lenses.  For  more  detailed  treatises  on 
these  subjects  we  issue  at  frequent  intervals  technical  pamphlets  under  the 


BAUSCH  &  LOME      /0S^      OPTICAL  COMPANY 


caption  of  "Scientific  and  Technical  Publications."  We  refer  the  reader  to 
page  147  for  further  information  regarding  this  series,  as  well  as  other  of  our 
publications. 

Our  optical  products  are  carefully  inspected  before  leaving  the  works, 
on  the  principle  that  upon  a  rigid  system  of  inspection  and  selection  depends, 
in  large  measure,  the  true  maintenance  of  a  high  quality.  They  are  obtainable 
from  the  regular  distributors  of  optical  goods,  whose  names  we  shall  be 
pleased  to  furnish  on  request.  Questions  pertaining  to  the  genuineness  of 
goods  offered  as  of  our  manufacture  will  be  answered  promptly  and  explicitly. 


The  trade  mark  shown  herewith  will  be  found  on  all  original  containers  of 
our  ophthalmic  lenses  and  on  all  apparatus  of  our  manufacture.  The  Punktal 
lenses  and  our  Ultex  Onepiece  Bifocals  also  have  the  trade  mark  engraved  on 
their  surface  near  the  right  central  margin.  While  this  is  so  lightly  etched  as  to 
be  best  seen  with  the  aid  of  a  magnifying  glass,  it  is  important  as  a  guarantee 
against  substitution. 

Manifold  order  books,  arranged  to  simplify  the  ordering  of  lenses  and  other 
products,  will  be  furnished  through  our  wholesale  distributors  on  request. 
We  also  furnish  prescription  blanks  bound  in  book  form,  conforming  to  both 
the  present  and  the  new  system  of  measuring  refraction.  These  blanks  are 
imprinted  with  the  protractor  scale  adopted  by  the  Naples  Convention  as  the 
international  standard. 

Wherever  practicable,  catalog  numbers  or  letters  have  been  used  to  sim- 
plify ordering  and  to  eliminate  errors.  These  designations  should  be  prefixed 
"Bausch  &  Lomb"  to  insure  obtaining  the  product  of  our  works.  Prices 
are  subject  to  change  without  notice.  For  the  convenience  of  the  trade  the 
principal  articles  of  our  manufacture  are  also  carried  in  stock  at  our  branches, 
where  they  may  be  inspected  and  information  obtained  relative  thereto. 
Our  Scientific  Bureau  at  Rochester  is  also  available  at  all  times  to  aid  the 
user  of  our  goods  in  solving  any  technical  problems  which  may  arise  relative 
to  their  use  or  application. 


B     A    U     S     C     H  &  L     O     M     IJ       /i^^%\       OPTICAL  COMPANY 


CHRONOLOGICAL  REVIEW  OF  OPTICS 

THE  earliest  mention  made  of  lenses  as  an  aid  to  imperfect  vision  would 
seem  to  place  their  discovery  in  the  last  half  of  the  thirteenth  century. 
From  two  different  sources  we  find  Italians  credited  with  their  inven- 
tion in  that  period.  According  to  the  chronicle  of  the  monastery  of  St.Katherine 
in  Pisa,  they  were  the  invention  of  one  of  the  monks,  Alessandro  della  Spina, 
while  Salvino  d'Armato,  called  Armati,  of  Florence,  is  also  credited  with 
their  introduction.  But  lenses  were  in  use  in  Germany  before  that  time, 
and  the  Chinese  were  probably  grinding  them  from  a  transparent  mineral 
substance  at  a  still  earlier  date. 

The  first  lenses  seem  to  have  been  of  the  convex  form  only.  We  find  among 
the  ancients  no  reference  to  diverging  lenses,  although  short  sight  was  well 
known  as  a  defect  of  the  eye.  It  is  not  until  the  end  of  the  seventeenth 
century  that  we  learn  of  concave  lenses  being  ground. 

A  most  important  period  in  the  history  of  optics  is  that  between  the  years 
1666  and  1669,  during  which  time  Newton  conducted  his  famous  experiments 
upon  the  composition  of  light.  He  found  that  white  light  is  composed  of  light 
rays  of  different  colors,  and  was  the  first  to  decompose  white  light  by  the  prism 
and  to  recompose  it.  White  light  is  dissociated  into  its  component  parts  by 
the  prism  because  the  different  colors  of  which  it  is  composed  are  unequally 
refracted.  During  the  centuries  that  succeeded  many  investigations  by  noted 
scientists  followed  the  work  of  Newton,  and  with  the  establishment  of  definite 
data  the  way  was  gradually  paved  for  further  improvements  in  optical  lenses 
and  apparatus. 

In  1804  Dr.  WoUaston  effectively  advocated  the  use  of  meniscus  formed 
spectacle  lenses  of  suitably  combined  curvatures,  instead  of  the  ordinary 
double  and  plano-convex  and  concave  types.  He  named  them  periscopic 
lenses,  because  with  the  concave  surface  nearest  the  eye  better  vision  and  a 
wider  field  of  view  resulted.  It  has  since  developed  that  meniscus  lenses  had 
already  been  recommended  for  spectacles  by  the  German  mathematician, 
C.  G.  Hertel,  in  a  booklet  published  in  1716. 

In  the  latter  part  of  the  year  1800  the  existence  of  astigmatism  in  the  eye 
was  brought  to  public  notice.  A  very  important  contribution  to  our  knowledge 
of  the  subject  was  made  in  1825  by  the  English  astronomer,  Airy,  who  first 
corrected  this  defect  in  his  own  eye  by  means  of  a  sphero-cylindrical  lens, 
made  under  his  direction  by  the  optician.  Fuller,  of  Ipswich. 

The  results  of  the  celebrated  dioptric  investigations  of  the  German 
mathematician.  Gauss,  were  announced  in  the  latter  part  of  the  year 
1840.      In    these    investigations    he    established    in    comparatively    simple 


B     A     V      K     C      11  &  L     O     iM     B        /^^^^       O    1'    T    I    C    A    L  COMPANY 


form  a  general  theory  of  refraction  through  centered  lenses  and  lens  systems, 
at  the  same  time  liaving  exact  regard  to  the  thickness  and  separation  of  the 
lenses.    He  introduced  the  now  well-known  principal  points  and  planes. 

The  first  record  of  the  use  of  toric  lenses  occurs,  as  nearly  as  can  be  learned, 
during  the  period  1840-44.  It  is  stated  by  Dr.  Javal  that  the  Roman  optician, 
Suscipi,  is  reported  to  have  applied  them  at  that  time  for  the  correction  of 
astigmatism,  one  lens  surface  being  convex  spherical  and  the  Toric  concave 
surface  being  placed  toward  the  eye. 

In  1845  followed  the  important  discovery  of  the  well-known  nodal  points  in 
lenses  by  Prof.  Listing.  These  nodal  points  are  of  special  interest  in  the  study 
of  the  eye ;  when  a  lens  or  lens  system  of  definite  thickness  is  surrounded  by 
the  same  medium,  as  air,  they  coincide  with  the  two  principal  points  of 
Gauss. 

Through  the  important  invention  of  the  ophthalmoscope  in  1851  by  Prof, 
von  Helmholtz,  the  ophthalmometer  with  plane  parallel  plates  in  1854  and 
the  telestereoscope  in  1857,  by  means  of  which  increased  stereoscopic  effect 
is  obtained,  new  instrimients  of  the  greatest  value  became  available  for  the 
examination  of  the  eye  and  the  study  of  vision. 

In  1866  the  employment  of  the  metric  system  for  measuring  and  designating 
the  power  of  lenses  was  advocated  by  the  ophthalmologist,  Nagel,  in  place  of 
the  old  English  inch  system  then  in  use.  The  term  "diopter,"  proposed  by 
Monoyer,  of  France  (written  in  English  "dioptry"  also  "dioptre"),  is  now 
universally  used  as  a  unit  in  the  metric  system  of  numbering  and  designates 
the  dioptric  or  refractive  power  of  a  lens  of  one  meter  (39.37  inches)  equivalent 
focal  length. 

In  the  year  1873  appeared  an  announcement  made  by  Prof.  Abbe,  of  Jena, 
Germany,  of  his  theory  on  the  formation  of  images  based  on  the  wave  theory 
of  light  and  having  special  reference  to  optics  of  the  microscope.  Through 
extensive  research  work  the  basis  was  laid  for  many  of  the  remarkable  im- 
provements in  optical  instruments  made  in  later  years. 

It  was  in  1878,  when  we  entered  the  general  American  lens  market,  that 
we  standardized  the  concave  curve  of  the  periscopic  lens — which  had  been 
made  of  variable  radii  for  the  scale  of  foci,  and  thus  made  possible  the  later 
development  of  the  cement  bifocals.  Beginning  at  that  time,  we  devoted  our 
efforts  to  the  establishment  of  lens  standards  now  recognized  as  "  Bausch  & 
LoMB  Quality." 

Through  the  establishment  of  the  celebrated  Avorks  of  Schott  &  Genossen 
in  1884,  the  new  Jena  glass  became  generally  available  throughout  the  world. 
A  new  era  in  optics  was  opened,  in  which  the  ingenuity  and  scientific  applica- 
tions of  all  interested  in  furthering  optical  progress  found  its  freest  scope. 

10 


B     A     I-      S     (•     If  it  L     O     M     B       /$^i^       OPTICAL  C    O    M    P   A    N    V 


For  ophthalmic  lenses  in  general  no  apparent  benefit  resulted.  The  glass 
already  available  was  fortunately  of  an  excellent  quality  for  the  purpose. 

The  method  of  examination  of  the  eye  for  refractive  errors  was  in  the 
meantime  very  much  facilitated  by  the  completion  of  new  apparatus 
for  the  purpose,  among  which  was  the  well-known  Javal-Schioetz  oj)hthal- 
mometer  invented  in  1882.  This  instrument  was  constructed  on  a  different 
principle  from  that  of  the  before  mentioned  ophthalmometer  of  Ilelmholtz 
and  was  further  improved  by  the  inventors  in  1889. 

In  the  years  from  1889  to  1904  important  communications  on  the  subject 
of  lens  improvements  were  presented  by  Dr.  F.  D.  Ostwalt,  Dr.  M.  Tscherning 
and  also  by  Dr.  Percival.  Let  us  remember  that  in  connection  with  all  of 
these  investigations,  the  importance  of  taking  into  consideration  the  center  of 
rotation  of  the  eye  is  emphasized. 

In  connection  with  the  study  of  lenses,  a  valuable  contribution  to  the  sub- 
ject of  ophthalmic  prisms  was  made  in  1890  by  C.  F.  Prentice.  He  proposed 
the  now  generally  accepted  designation  of  "prism  dioptry"  as  a  unit  to  express 
the  refractive  power  of  a  prism,  which  produces  a  tangent  deflection,  or 
deviation  of  one  centimeter  (1/100  meter)  at  a  distance  of  one  meter. 

In  the  year  1893  appeared  the  important  work  on  "The  Theory  of  Optical 
Instruments  According  to  Abbe,"  written  by  Dr.  S.  Czapski  of  the  Zeiss 
Works.  In  this  treatise,  as  also  in  the  later  works  of  Drs.  Czapski  and  M. 
von  Rohr  and  their  associates  on  the  scientific  staff  of  the  Zeiss  Works,  the 
results  of  many  years  of  epoch-making  investigations  in  the  field  of  optics, 
carried  on  by  Prof.  Abbe  and  his  collaborators,  have  been  freely  placed  in  the 
hands  of  those  interested  in  the  subject. 

Prior  to  this,  in  1891,  a  valuable  contribution  had  also  been  published  on 
the  theory  of  astigmatism  by  the  ^Swedish  ophthalmologist,  Gullstrand,  who 
since  then  has  greatly  aided  in  advancing  ophthalmological  progress  by  con- 
ducting important  mathematical  and  optical  research  work. 

With  the  advent  of  the  twentieth  century,  it  is  noteworthy  that  the  use  of 
periscopic  lenses,  which  had  been  introduced  by  Dr.  Wollaston  about  one 
hundred  years  before,  received  a  new  impetus  through  the  extended  applica- 
tion of  deep  curved  forms.  This  led  to  their  designation  as  meniscus  lenses, 
to  distinguish  them  from  the  earlier  periscopic  forms. 

Through  the  introduction  of  improved  methods  for  manufacturing  meniscus 
and  toric  lenses,  it  has  become  possible  to  render  more  generally  available  the 
valuable  properties  possessed  by  these  types  for  the  correction  of  astigmatism. 
The  increase  in  their  use  has  been  correspondingly  marked.  We  commenced  the 
manufacture  of  the  meniscus  types  in  1896  and  the  toric  forms  two  years  later. 

About  1784  Benjamin  Franklin  had  a  pair  of  spectacles  made,  each  lens 

11 


n  A  T-   S  (■   II     &     h     O  M  B   /^J$\   OPTICAL    COMPANY 


consisting  of  two  half  ovals,  the  upper  one  being  concave,  and  the 
lower  convex.      This  was  the  origin  of  the  bifocal  lens  now  so  widely  used. 

Since  the  use  of  bifocals  by  Franklin,  numerous  inventions  have  led  to  the 
perfection  of  these  useful  lenses.  The  solid  bifocal  with  prisms  of  the  weaker 
or  distance  power,  base  down,  and  the  reading  portion,  base  up,  was  extremely 
annoying  to  the  wearer  and  was  followed  by  the  split  bifocal,  consisting  of 
two  pieces  joined  in  the  center  but  capable  of  being  centered  in  each  half 
lens  independently.     These  lenses  did  not  prove  very  popular. 

In  1888  August  Morck  invented  the  cement  bifocal,  consisting  of  a  peri- 
scopic  lens,  to  the  concave  curve  of  which  was  cemented  a  thin  glass  segment 
finished  to  the  corresponding  concave  curve  of  the  major  periscopic  lens  and 
ground  to  the  regular  focus  on  the  other  side,  then  cemented  to  give  the 
desired  reading  addition.  These  lenses  have  been  in  popular  demand  and 
are  extensively  used  at  present. 

The  so-called  Perfection  Bifocal  followed  shortly  after;  a  major  lens  Avas 
cut  out  in  the  lower  portion,  either  semi-circular  or  crescent-shaped,  and  a 
seu'inent  of  stronger  focus,  cut  from  another  lens,  inserted.  These  lenses 
could  also  be  centered  and  used  in  either  frames  or  rimless  mounts,  in  Avliich 
latter  case  they  were  cemented. 

Another  cement  bifocal  known  as  "Opifex"  has  become  popular.  The 
segment  is  ground  to  a  "knife  edge"  and  is  as  nearly  invisible  as  it  is  possible 
to  make  a  cemented  bifocal  lens.  Many  other  inventions  in  bifocals  are 
recorded,  but  few  have  attained  the  practical  stage  of  existence. 

llie  Kryptok  lens  was  later  introduced  and  met  Avith  immediate  favor. 
The  major  lens  of  crown  glass  has  a  depression  ground  in  the  lower  portion. 
Into  this  depression  is  counter-sunk  a  piece  of  glass  of  different  refractive  in- 
dex, usually  a  flint  disc.  Ilie  two  pieces  are  then  fused  together  and  ground  and 
polished,  making  a  perfectly  homogeneous,  as  well  as  an  invisible  bifocal  lens. 

The  latest  invention  in  bifocal  lenses,  however,  is  the  Onepiece,  which  is  a 
solid  or  one-piece  bifocal  lens,  patents  for  which  have  been  granted  in  the 
United  States  in  1906,  1909  and  1910.  These  lenses  are  ground  and  polished 
both  in  the  upper  and  in  the  lower  portions,  absolutely  free  from  the  dis- 
turbing prismatic  effect  attributed  to  other  bifocal  lenses  ground  from  one 
piece  of  glass.  It  is  possible  to  make  them  with  a  large  reading  portion,  but 
the  greatest  claim  made  for  them  is  their  absolute  freedom  from  disturbing 
color  or  chromatic  aberrations. 

Among  the  recent  investigations  in  the  field  of  ophthalmic  lenses,  tlie  work 
carried  forward  by  Dr.  Gullstrand  and  Dr.  M.  von  Rohr  is  especially  worthy 
of  note.  In  1912  Dr.  von  Rohr  published  in  his  work,  "Das  Auge  und  die 
Brille,"  the  result  of  his  investigation  regarding  the  importance  of  the  center 

12 


B     A     U      S     C      II  &  L     O     .M      R        /^E^        OPTICAL  C    O    M     T    A    X    Y 


of  rotation  of  the  eve  and  the  relation  of  this  center  of  rotation  to  the  correc- 
tion of  refractive  errors  by  means  of  ophthalmic  lenses. 

The  work  of  Dr.  (iullstrand  and  Dr.  von  Rohr  resulted  in  the  accomplish- 
ment of  notable  achievements,  both  in  the  improvement  of  apparatus  for 
testing  errors  of  vision  and  in  ophthalmic  lenses,  v^^ith  special  reference  to 
deep  curved  lenses. 

In  all  deep-curved  lenses.  Meniscus  and  Toric,  the  one  surface  is  ground  to 
a  standard  curve.  A  curve  of  six  diopters  has  been  adopted  as  the  standard 
by  American  lens  manufacturers,  although  other  curves  have  been  used. 
While  in  the  weaker  foci  of  these  lenses  the  lens  correction  is  of  lesser  import- 
ance, in  the  great  number  of  powers  there  is  a  certain  amount  of  astigmatism; 
it  was  for  the  correction  of  this  astigmatism  and  the  perfecting  of  the  deep 
curved  lens  that  Dr.  von  Rohr  published  his  extensive  investigation  referred 
to  above.  He  desired  to  correct  the  astigmatism  marked  towards  the  marginal 
portion  in  all  foci  and  computed  the  powder  of  each  lens  and  its  correction 
separately.  These  lenses,  resulting  from  the  work  of  Dr.  von  Rohr,  were 
named  by  him  "Punktal"  and  "Katral."  These  words  are  registered  as 
trade  marks  in  the  United  States  by  the  Carl  Zeiss  Works,  and  we,  as  their 
associates,  hold  the  exclusive  manufacturing  rights  for  the  lenses  on  the 
American  Continent.     (See  pages  75  and  80.) 

By  the  present  method  of  refraction  test  lenses,  double  convex  and  double 
concave  in  form,  have  been  and  are  still  used.  Since  the  more  general  adop- 
tion of  deep  curved  lenses,  many  irregularities,  especially  in  the  stronger 
powers,  have  resulted  from  the  fact  that  the  principal  points  of  the  two  forms 
of  lenses  do  not  coincide.  The  reader  is  referred  to  page  36  of  this  volume 
and  to  our  recent  publication,  "The  Substitution  of  Meniscus  for  Flat 
Ophthalmic  Lenses  and  a  New  System  of  Designating  Their  Powers,"  for 
more  detailed  information  on  the  subject. 

It  is  a  notable  fact  that  optical  literature  in  general,  since  the  beginning  of 
the  century,  has  been  enriched  by  the  contributions  of  the  physicists,  mathe- 
maticians, ophthalmologists  and  opticians  of  Europe  and  America.  In 
addition  to  the  larger  works  in  optics,  there  has  also  accumulated  a  vast  fund 
of  short  essays  and  articles  in  the  professional  and  trade  journals  of  both 
continents,  freely  conveying  for  the  benefit  of  all  the  experience  of  the  many 
workers  in  a  most  useful  branch  of  human  endeavor. 


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THE  THEORY  OF  LENS  ACTION 


IN  commemoration  of  the  ninth  annual  convention  of  the  American  Optical 
Association,  in  1906,  we  published  a  treatise  on  "Lenses."  This  little 
book  has  met  with  such  favor  among  the  optical  trade  and  profession 
that  Ave  have  received  frequent  requests  for  copies  during  the  intervening 
years,  while  one  chapter,  entitled  "The  Theory  of  Lens  Action,"  has  even 
been  republished  by  otliers.  In  light  of  these  considerations  and  the  general 
value  of  the  matter  itself,  we  have  thought  best  to  reprint  this  chapter  here  in 
order  to  preserve  it  in  more  definite  reference  form.  The  chapter  follows  in 
full : 

"Before  inquiring  into  the  nature  of  lenses  and  their  action,  it  appears 
desirable  to  obtain  some  notion  of  the  agency  upon  which  they  act,  namely, 
of  light  itself.  To  arrive  at  this,  we  must  betake  ourselves,  for  the  moment, 
into  the  realm  of  the  imagination,  into  a  domain  of  abstractions  and  hypotheses. 
But  in  doing  so,  we  must  not  make  the  hasty  conclusion  that  the  results  so 
found  are  of  no  value,  or  what  is  worse,  of  imaginary  value  only.  On  the  con- 
trary, the  assumptions  which  we  introduce  have  been  employed  for  hundreds 
of  years  by  our  ablest  and  boldest  intellectual  giants  and  have  led  them  to 
truths  of  unimpeachable  character,  truths  which  belong  to  the  most  priceless 
possessions  of  mankind  and  have  brought  us,  as  nearly  as  may  be,  to  a  glim- 
mering of  the  unknowable,  to  a  conviction  of  the  unity  of  the  universe. 

"  Ivct  us  imagine,  then,  that  all  space,  the  entire  universe  in  its  outermost 
and  innermost  depths  is  permeated  by  a  medium  or  substance  Avhich  we  know 
only  through  its  manifestations,  and  which,  for  want  of  a  better  name,  we 
call  eiher.  At  any  point  in  this  hypothetical  or  imaginary  substance  which  we 
assume  as  penetrating  all  matter,  suns  and  atoms  alike,  conceive,  now,  a 
disturbance  set  up,  a  disturbance  of  such  a  nature  that  the  particles  of  ether 
about  the  point  in  question  are  thrown  into  violent  and  rapid  agitation.  Sup- 
pose, further,  the  ether  endowed  with  qualities  which  enable  it  to  transmit 
this  agitation  to  the  neighboring  particles,  that  is  to  propagate  the  disturbance 
in  all  directions  in  the  form  of  waves,  much  as,  when  we  throw  a  stone  into  a 
quiet  pool,  we  see  the  ripples  and  waves  travel  outward 
in  every  direction.  Then  according  as  the  rapidity  of  the 
movements  of  the  ether  particles  reaches  or  exceeds  a  cer- 
tain limit,  we  shall  have  either  the  electric  waves  of  wire- 
less telegraphy  or  those  waves  which,  impinging  upon  the 
eye  or  the  photographic  plate,  we  recognize  as  ligJit.  The 
science  of  light  in  all  its  forms  is  our  familiar  and  cher- 
FiG.  1  ished  science  of  optics. 


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k/\tt:w\ - 


"Leaving  aside  certain  phenomena,  which  are  scarcely  of  interest  liere,  we 
may  say,  what  all  will  probably  admit,  that  lioht  travels  in  straight  lines; 
we  cannot  see  around  a  corner.     This  is  the  first  fundamental  law  of  optics. 

"The  second  fundamental  law  of  o})tics  concerns  itself  with  the  speed  or 
velocity  at  which  light  travels. 

"In  inter-stellar  space,  in  the  regions  beyond  our  earth,  light  travels  at  a 
rate  quite  beyond  our  minds  to  grasp.  Experiments  of  extraordinary  delicacy 
and  precision  have  proven  beyond  a  doubt  that  this  speed  is  186,000  miles 
per  second ;  in  other  words,  could  a  ray  of  light  be  made  to  pass  around  the 
earth,  it  would  circumnavigate  the  same  more  than  seven  times  every  second. 
Incidentally  we  may  mention  that  electricity  travels  at  the  same  speed  as 
light,  forcing  us  to  the  conclusion  that  light  and  electricity  are,  in  the  last 
analysis,  identical.  The  recognition  of  truths  like  these  is  the  highest  recom- 
pense of  men  of  science. 

"But  exact  experimentation  has  done  more  than  this.  Actual  measure- 
ments have  shown  that  the  velocity  of  light  is  different  in  different  substances ; 
we  may  say,  light  travels  slower  the  denser  the  medium  or  substance  through 
which  it  is  passing;  in  ordinary  crown  glass  it  travels  slower  than  in  air,  in 
ordinary  flint  glass  it  travels  slower  than  in  crown.  And  the  second  funda- 
mental law  of  optics  is,  that  the  ratio  or  quotient  of  the  velocities  of  light  in 
any  two  given  media  or  substances  is  invariably  the  same  number;  this  num- 
ber we  may  call  a  natural  constant,  a  quantity  which  nature  has  predeter- 
mined and  has  permanently  attached  to  the  substances  in  question  and  which, 
so  far  as  the  phenomena  of  light  are  concerned,  completely  characterizes 
those  substances  relative  to  each  other.  This  quantity  or  number,  whose 
importance  in  optics  is  manifestly  second  to  none,  has  received  the  name  of 
Refractive  Index  or  Index  of  Refraction. 

"As  an  example  we  cite:  Light  travels  at  the  rate  of  186,000  miles  per 
second  in  air,  122,000  miles  per  second  in  ordinary  optical  glass;  186,000 
divided  by  122,000  is  1.53,  which  is  the  refractive  index  of  this  glass,  referred 
to  air  as  standard,  air  having  the  refractive  index  1.00. 

"  Having  thus  briefly  reviewed  the  properties  of  light  itself,  let  us  turn  from 
the  abstract  to  the  concrete  and  examine  the  simplest  case  of  light-action, 
viz.,  the  action  of  a  plane  glass  surface  on  a  beam  of  light. 

"  We  have  said  before  that  light  travels  in  straight  lines  in  the  form  of  waves, 
generally  spherical,  by  which  we  mean  that  the  light  disturbance,  starting 
from  a  radiant  center  C  (Fig.  2)  successively  reaches  at  definite  times  the 
points  P  Q  R,  located  on  a  line  drawn  from  this  center,  and  that  all  points  as 
P'  and  P",  Q'  and  Q",  R'  and  R",  situated  on  the  wave  surfaces  of  P,  Q,  R 
respectively,  are  reached  in  the  same  time.    These  lines  C  R,  C  R',  etc.,  which 

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give  the  path  of  the  Hght,  are  termed  rays  and  hereafter  we  may  often  confine 
ourselves  to  them,  leaving  the  waves  out  of  consideration. 

"When  the  wave  motion  has  traversed   a  considerable  distance,   as  for 
example,  in  coming  from  the  sun,  the  outermost  wave-front,  R'  RR"  (Fig.  2) 


Fig.  2 

will  evidently  be  much  flattened,  so  that  we  can  safely  assume  the  portion  of  it 
that  we  are  considering  to  be  plane.  Imagine  such  a  plane  wave-front, 
R'  R  R",  (Fig.  3)  striking  a  plane  surface  of  glass  obliquely.  Then  the  light 
traveling  along  the  ray  P"  R"  will  enter  the  glass  sooner  than  that  along  the 
ray  P'  R'  and  will,  consequently,  since  light  travels  slower  in  glass  than  in  air,  be 


Fig.  3 

retarded  or  commence  to  travel  slower,  before  that  along  P'  R'  does.  During 
the  time  the  light  has  traveled  from  R'  to  S'  in  air,  it  has  only  traveled  from 
R"  to  S"  in  glass. 

"Now  experiment  has  shown,  and  mathematical  analysis  has  demon- 
strated, that  a  ray  falling  thus  obliquely  on  a  glass  surface  is  deflected  or  bent 
from  its  original  direction  P"  R"  (Fig.  4),  and  in  such  a  sense  that  it  approaches 
the  perpendicular  or  normal  N  N'  drawn  through  the  point  of  incidence  R". 
Carrying  out  this  for  all  points  of  our  original  incident  wave-front,  R'  R  R" 
(Fig.  3),  we  obtain  the  resultant,  so-called  refracted  wave-front,  S'  S  S",  and 
have  before  us  the  phenomenon  of  Refraction. 

16 


B    A     U     S     C     H  &  L     O     M     IJ        z;^!^      O    1'    T    I    C    A    L  COM    P    A    X    V 


"Again  we  find,  as  one  of  Nature's  laws,  a  remarkable  fixed  relation  between 
the  angles  made  by  the  incident  and  refracted  rays  with  the  perpendicular  or 
normal  to  the  surface,  or  ratlior  between  certain  quantities  or  numbers  called 


sines  which  fix  the  size  or  magnitude  of  those  angles.   This  law  may  be  enun- 
ciated thus: 

"The  ratio  or  quotient  of  the  sine  of  the  angle  of  incidence  i  (Fig.  4)  and 
the  sine  of  the  angle  of  refraction  r  is  invariably  the  same  number  for  two 
given  substances  or  media,  namely  the  same  number  which  we  have  seen 
above  to  be  the  Index  of  Refraction.  By  means  of  this  simple  law,  the  path 
of  a  ray  of  light  through  any  number  of  refracting  substances  may  be  calculated. 


Fig.  5 

"If,  after  passing  through  a  thickness  of  glass,  the  beam  strikes  a  second 
plane  surface  separating  it  from  air,  as  in  a  piano-parallel  plate  (Fig.  5), 
the  beam  will  be  again  deflected  to  the  same  extent  but  in  a  sense  opposite 
to  that  at  the  first  refraction.  The  beam  as  a  whole  is  shifted  laterally.  If 
the  second  plane  surface  is  inclined  to  the  first  surface  as  in  prism  (Fig.  6), 
the  direction  of  the  incident  beam  will  be  changed  and  to  an  extent  depending 
on  the  angle  of  the  prism.  This  is  immediately  apparent  from  Fig.  6.  Turning 

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Fig.  6 


now  to  curved  refracting  surfaces,  we  note  that  any  very  small  portion,  as 
A  B  (Fig.  7)  of  the  same,  may  be  regarded  as  a  plane,  whence  we  may  imme- 
diately apply  our  laws  for  plane  surfaces  as  found  above. 


Fig.  7 

"Suppose  a  second  curved  bounding  surface  (Fig.  8)  forming,  as  is  well 
known,  a  lens.  Then,  as  shown  in  Fig.  8,  we  may  imagine  the  whole  lens 
divided  into  small  prisms  or  prismatic  elements  and  the  results  found  in  the 
case  of  prismatic  refraction  are  applicable.  The  rays  or  beam  of  light  a  b, 
falling  perpendicularly  on  the  central  portion  of  the  lens,  go  straight  on; 
the  beam  c  d,  falling  obliquely,  is  deilected. 


Fig.  8 


|<5^"We  are  now  in  a  position  to  take  a  final  step  in  our  study  of  lenses,  and 
that  is,  to  consider  the  power  of  a  lens  and  its  allied  term, /oca/  length. 

"The  word  power  naturally  leads  to  the  word  work,  power  being  in  general 


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BAUSCH  &  LOME       /^^^      OPTICAL  COMPANY 


the  capacity  of  doing  work;    power  is  producc-d  for  ihc  sake  of  llic  work  il 
can  perform.    What  'work,'  we  niav  ask,  docs  :i  k'lis  do? 

"We  have  just  seen  (Fig.  8)  that  when  a  hohl  wave  coming  from  a  distant 
source  falls  upon  a  lens,  the  direction  in  which  the  various  parts  of  the  wave 
move  is  altered.  If  we  look  more  closely,  if  we  trace  the  action  of  all  Ihc 
elementary  prisms  into  which  the  lens  is  conceived  to  he  divided,  we  shall  see 
that  \\ieform  or  curvature  of  the  w-ave-front  as  a  vhulc  changes  in  its  passage 
through  the  lens,  in  as  much  as  those  parts  of  the  wave  that  pass  through  the 
center  of  the  lens  have  a  greater  thickness  of  glass  to  traverse  than  those 
passing  through  the  edge,  and,  travel  being  slower  and  more  difficult  in  glass 
than  in  air,  are  belated  with  respect  to  the  marginal  rays.  For  instance,  by 
the  time  the  light  along  B  L  (Fig.  9)  has  just  emerged  from  the  lens  at  O, 


Fig.  9 

the  light  along  A  K  has  regained  its  freedom  and  has  already  reached  the 
point  N  at  some  distance  from  the  lens.  The  original  plane  w^ave-front  ABC 
is  thus  transformed  into  a  curved  wave-front  N  O  P,  with  the  rays  having 
their  center  at  F. 

"The  point  F,  toward  which  the  emergent  light  converges,  is  the  Focal 
Point  or  Focus  of  the  lens. 

"The  'work'  of  the  lens  consists  in  forcing  the  wave  to  assume  a  different 
shape  or  in  causing  the  light  to  converge  toward  the  focus,  instead  of,  as 
originally,  diverging  from  the  distant  source.  The  amount  of  this  change  of 
form  of  the  wave  is  a  measure  of  the  'power'  of  the  lens  and  depends  on  the 
curvature  of  the  lens  surfaces  and  the  lens  material.  The  stronger  the  curva- 
tures of  the  lens  surfaces,  the  more  will  they  alter  the  shape  of  the  wave-front, 
the  nearer,  as  a  rule,  will  the  focus  lie  to  the  lens. 

"  In  order  to  characterize  a  lens,  it  is  needful  to  look  about  for  a  measure 
of  its  strength  or  power.  The  direct  measurement  of  the  w^ave  curvature  is 
impracticable;  the  focal  point  on  the  other  hand,  has,  in  general,  a  real  exist- 
ence and  can  be  actually  located  by  placing  a  screen  so  as  to  receive  upon  it 
the  image  of  a  distant  object,  and  the  size  of  this  image,  is,  as  we  shall  now 
see,  the  true  measure  of  the  power  of  the  lens. 

"  From  the  above  it  will  be  clear,  and  by  the  simplest  kind  of  experiments 
we  can  easily  convince  ourselves,  that  the  less  curved  the  lens  surfaces  are, 

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the  farther  away  from  the  lens  will  the  image  of  an  object  lie  and,  as  is  evident 
from  Fig.  10,  the  larger  will  this  image  be.  To  avoid  the  necessity  of  choosing 
an  object  at  a  definite  distance,  we  assume  one  at  a  very  great  or  infinite  dis- 


FiG.  10 


tance,  in  which  case  its  size  can  of  course  be  expressed  only  in  angular  measure. 
See  Fig.  11. 

"Then  we  define  the  power  of  a  lens  as  the  ratio  of  one-half  of  the  apparent 
size  of  a  distant  object  A  B  expressed  as  an  angle,  to  one-half  the  real  size  of 


Fig.  11 

the  image  C  D  of  this  object,  the  angle  being  measured,  not  in  degrees,  but 
by  a  certain  mathematical  quantity  called  'tangent,'  which  fixes  its  magnitude 
and  of  which  tables  have  been  computed. 

"  We  have  thus  brought  the  power  of  a  lens  into  relation  with  its  every  day 
use,  which  is  to  produce  images  at  given  points  and  of  a  given  magnitude, 
and  have  shown  further  that  power  is  a  physical  attribute  of  the  lens,  that  it 
cannot,  as  it  were,  be  measured  with  a  yard  stick  but  has  a  greater  and  deeper 
meaning  than  a  mere  length. 

"The  power  of  a  lens  is  often,  but  sometimes  erroneously,  measured  by 
the  distance  of  the  focus  from  the  lens,  or  as  we  may  say,  by  the  'back  focal 
difitance'  C  F  (Fig.  12).  If  we  compare  two  lenses  of  different  forms  (Figs.  12 
and  13)  but  so  constructed  as  to  give  images  of  the  same  size  and  consequently 


Fig.  12 


Fig.  13 


20 


B     A     U      S     C      11 


L     O     M     B 


O    1'    T    I    ('    A    I. 


C    O    M     1'    A    X    Y 


having  the  same  power,  we  note  that  the  'back  focal  distance'  is  entirely  dif- 
ferent in  the  two  cases,  showing  at  once  that  this  distance  is  not  the  true 
measure  of  power.  The  true  measure  of  power  is  found  hv  measuring  the  size 
of  the  image  and  the  apparent  size  of  the  object  and  finding  the  ratio  men- 
tioned above. 

"  If  we  divide  unity,  that  is  one,  by  this  ratio,  we  find  the  reciprocal  of  the 
power  and  have  what  is  known  as  the  true  or  equivalent  focal  length;  this  is, 
as  we  have  seen,  not  at  all  the  same  as  the  'focal  distance,'  often  called  'back 
focus.'  In  case  we  feel  the  necessity  of  measuring  off  this  true  focal  length 
in  the  neighborhood  of  the  lens,  we  ought  not  to  startyVowi  the  lens,  but  should 
take  as  our  starting-point  the  focal  point  itself  and  measure  toward  the  lens, 
to  the  first,  or  primary,  principal  point.  For  the  focus  is  the  only  point  con- 
nected with  the  lens  which  has  any  real  existence.  The  somewhat  cumbrous 
expression,  equivalent  focal  length,  is  frequently  abridged  to  focus. 

"The  oft  mooted  question,  from  what  point  is  the  focal  length  to  be  meas- 
ured, is  thus  simply  answered :  From  the  focal  yoint  to  the  corresponding 
principal  point. 

"As  in  other  branches  of  applied  science,  it  is  essential  to  have  a  standard 
lens,  a  lens  to  which,  as  regards  power,  all  lenses  may  be  referred.  The 
standard  or  unit  which  has  been  almost  universally  adopted  is,  as  is  well 
known,  a  lens  having  a  true  focal  length  of  one  meter,  its  power  being  termed 
Diopter  or  Dioptric. 

"The  kind  of  lenses  most  generally  used  have  spherical  surfaces,  and  they 
can  be  divided  into  two  groups ;   the  first  group,  thicker  in  the  middle  than  at 


Converging  Lenses 


Diverging  Lenses 


Piano- 
Convex 


Periscopic 
Convex 


/  Positive  \ 
VMeniscus/ 
Thicker  in  the  middle  than  at  the  edge 


/Negative\ 
VMeniscus/ 
Thinner  in  the  middle  than  at  the  edge 


Fig.  U 


the  edge,  have  a  convergent  effect  on  the  rays  of  light;  the  second  group, 
thinner  in  the  middle  than  at  the  edge,  have  a  divergent  effect.  These  different 
forms  are  shown  in  Fig.  14. 


21 


B     A     U      S     C     H 


L     O     M     B 


OPTICAL 


COM    P   A    N   Y 


"The  positive  and  negative  menisci,  also  called  periscopic  convex  and 
periscopic  concave  lenses  respectively,  are  useful  in  cases  where  a  large  field 
of  vision  is  desired. 

"We  have  so  far  considered  lenses  with  spherical  surfaces  only,  and  now 

turn  our  attention  to  those  bounded  by  sur- 
faces whose  curvatures  vary  in  different 
directions. 

"  For  certain  defects  in  the  eye  spherical 
lenses  no  longer  suffice,  and  it  has  been 
found  that  glasses  having  cylindrical  sur- 
faces aid  in  correcting  these  errors.  With 
such  lens-surfaces  the  best  effect  is  produced 
in  but  one  'meridian,'  namely  in  the  '  mer- 
idian '  or  plane  at  right  angles  to  the  so-called 
'  axis,'  a  c  &  in  Fig.  15  assumed  in  the  middle 
of  the  lens,  and  called  'axis'  because  parallel 
to  the  axis  m  n  of  the  cylinder  of  which  the 
lens  surface  is  a  part.  This  effect  is  due  to 
the  peculiar  nature  of  the  curvature  of  the 
cylindrical  surface  and  the  lens  action  is 
convergent  or  divergent  according  as  the  surface  is  convex  or  concave.  In 
the  plane  a  m  g  k  n  h,  passing  through  the  axis  a  b  c,  rays  are  refracted 
without  change  in  direction,  this  part  of  the  lens  having  the  same  effect 
as  a  plane-parallel  plate.  It  is  evident  that  the  image  of  a  distant  luminous 
point  formed  by  this  lens  will  be  a  luminous  line  g  h  k. 

"Where  it  is  desirable  to  have  the  combined  effect  of  a  spherical  and  a 


Fig.  15 

Action  of  Piano-Cylindrical  Lens  on 
Parallel  Ravs 


Fig.  16 

Action  of  a  Sphero-Cyliudrical  Lens  on  Parallel  Rays 


B    A    U     S     C     H 


LOME 


OPTICAL 


COM    PANT 


cylindrical  lens,  lenses  having  one  surface  spherical  and  the  other  cylindrical 
are  employed,  and  applying  the  before-mentioned  principles  we  can  readily 
gain  an  insight  into  their  mode  of  action.  In  Fig.  16  the  action  of  such  a 
sphero-cylindrical  lens  on  a  beam  of  light  is  shown;  p  q  s  r  represents  the 
spherical  surface,  and  a  c  h  indicates  the  axis  of  the  cylindrical  surface;  it 
is  apparent  that  in  one  meridian  the  spherical  and  the  cylindrical  surfaces 
work  together,  while  in  the  meridian  containing  the  axis  a  c  b  only  the 
spherical  component  acts. 

"In  addition  to  the  general  forms  of  spherical  and  cylindrical  lenses  there 
has  come  into  use  in  recent  years,  although  known  of  long  before,  a  type  of 
lens  having  a  toric  surface.  These  toric  lenses,  as  they  are  called,  have  come 
into  favor  where  the  advantage  of  the  periscopic  principle  in  connection  with 
cylindric  effect  is  sought.  From  the  nature  of  the  curvature  of  the  toric  sur- 
face, which  possesses  different  radii  of  curvature  in  different  meridians,  as  is 
shown  in  Figs.  17  and  18,  it  is  evident  that  the  manufacture  of  accurate  toric 


Fig.  17 

Perspective  View  of  Toric  Lens  and  Torus 


lenses  offers  many  difficulties.  Fig.  17  presents  a  perspective  view  of  a  torus. 
The  plano-convex  lens  shown  may  be  considered  cut  out  of  this  torus  and 
having  the  'meridians'  a  c  b  and  d  c  e. 

"  In  Fig.  18  are  shown  sectional  views  through  the  vertical  meridian  dee 
and  the  horizontal  meridian  o  c  6  of  a  plano-convex  toric  lens,  indicating  how 
the  refraction  of  the  parallel  rays  varies  in  these  two  meridians.  The  dotted 
outline  shows  how  the  torus  may  be  generated,  R  and  r  being  the  radii  of 


U     A    U     S     C     H  &  LOME       /^^S^       OPTICAL  COMPANY 


curvature  in  their  respective  meridian  planes;   when  r  becomes  equal  to  R  it 
is  evident  that  a  spherical  surface  will  result. 


N 

^<. 

^ 

''             \ 

\ 

/          r 

Fig.  18 

Sectional  Views  of  Toric  Lens  and  Torus 


"  In  the  use  of  glasses  the  inconvenience  often  arising  from  requiring  lenses 
of  different  focus  for  near  and  distant  vision  has  lead  to  the  introduction  of  a 
variety  of  forms  of  double  focus  lenses,  now  well-known  as  'bifocals,'  the 
principle  of  their  construction  being  to  have  the  upper  portion  of  the  lens  of 
different  power  from  the  lower." 


U 


IJ     A    U     S     C     H  &  L     O     M     B       /^^V       OPTICAL  COMPANY 


OPTICAL  GLASS 

GLASS  is  the  most  important  substance  with  which  the  optometrist  or 
.  optician  is  concerned  in  his  work,  whether  in  the  manufacture  of 
optical  instruments  or  in  the  practice  of  optometry.  The  science  of 
optics  is  the  science  of  hght.  Witliout  the  art  of  gUiss  making,  liowever, 
scientists,  ancient  and  modern,  woukl  have  found  it  difficult,  if  not  impossible, 
to  control  the  action  of  light  to  meet  the  solution  of  the  mathematical  problems 
confronting  them  in  the  study  of  light  phenomena. 

While  it  is  true  that  other  substances  have  been  used  to  bend  the  rays  of 
light,  glass  is  universally  accepted  as  the  best  material  known  for  the  purpose. 
Thus  the  optician  and  the  glass  maker  have  contributed  jointly  to  the  science 
of  optics,  to  the  benefit  of  posterity. 

Glass  is  an  amorphous,  transparent  or  translucent  mixture  of  silicates  by 
definite  chemical  formulae.  The  essential  materials  for  glass  making  are 
silica,  an  alkali  and  lime  or  lead.  Part  of  the  lime  or  lead  may  be  replaced 
by  oxides  of  other  metals,  also  by  certain  borates  and  phosphates  to  replace  a 
part  of  the  silica,  especially  in  glass  manufactured  for  optical  purposes. 

Before  the  era  of  modern  optical  glass  manufacture  there  were  only  two 
types  of  glass  available  to  the  optician,  the  one  a  lime  glass  with  a  low  refrac- 
tion and  small  dispersion  (crown  glass) ,  and  the  other  a  lead  glass  with  a  rela- 
tively high  index  and  large  dispersion  (flint  glass).  Although  the  terms 
"crown"  and  "flint"  are  still  used,  they  have  no  definite  meaning  to  the 
optician  of  to-day,  as  in  late  years  the  glass  manufacturers,  in  answer  to  the 
demand  of  modern  optics,  have  succeeded  in  putting  upon  the  market  so 
many  new  varieties  that  there  is  no  longer  the  sharp  division  between  the  two 
kinds.  It  may  be  interesting  to  state  here  that  in  the  last  catalog  of  Schott 
&  Genossen  there  are  listed  one  hundred  dilTerent  varieties  of  optical  glass. 

The  requirements  demanded  of  glass  for  ophthalmic  lenses,  while  stringent, 
are  not  so  many  as  those  required  for  glass  to  be  used  in  other  optical  instru- 
ments. Glass  for  ophthalmic  lenses  must  be  hard,  durable,  homogenous,  free 
from  bubbles  and  strife,  but  also  of  a  constant  index  of  refraction.  The 
crown  glass  we  employ  in  our  products  has  an  index  of  1.5'-23  and  a  dispersion 
of  approximately  58.5.  With  the  introduction  of  the  deeper  forms  of  lenses 
the  moulding  of  glass  has  been  introduced.  Hie  process  carried  on  in  our 
w^orks  insures,  under  our  rigid  inspection,  the  proper  annealing  and  freedom 
from  other  glass  defects. 

Roentgen  glass  is  a  transparent  glass  A^'hich  the  Roentgen  or  X-ray  cannot 
penetrate.  liCnses  produced  from  this  material  offer  protection  to  the  patient, 
physician  or  operator  while  exposures  with  the  X-ray  are  being  made. 

25 


BAUSCH  &  LOME       /^l^       OPTICAL  COMPANY 


Colored  glass  is  used  to  moderate  the  amount  of  light  which  enters  the 
eye.  Such  glass  is  produced  by  adding  metal  oxides  to  the  mass  of 
melted  material;  cobalt-oxide  giving  the  blue;  chrom-oxide,  green;  gold- 
oxide,  ruby;  silver-oxide,  yellow;  manganese-oxide,  violet.  Smoke  glass 
is  produced  by  using  several  of  the  above-mentioned  oxides. 

Light  when  passing  through  glass  will,  generally  speaking,  suffer  a  reduc- 
tion in  intensity.  The  light  lost  in  transmission  is  said  to  be  absorbed,  and 
the  extent  thereof  is  the  intrinsic  absorption  of  the  glass.  The  volume  of  the 
light  transmitted  is  said  to  be  the  intrinsic  transmission  of  the  glass.  It  has 
been  satisfactorily  proved  that  lost  light  is  changed  to  heat. 

All  glasses  do  not  have  the  same  absorption  for  the  same  color,  nor  does 
any  one  have  the  same  absorption  for  all  colors.  Thus  one  specimen  might 
pass  a  great  deal  of  red  and  green  and  absorb  nearly  all  blue  light,  while 
another  might  pass  a  great  deal  of  green  and  blue  and  absorb  nearly  all  the 
red  light  of  the  spectrum.  Such  absorption  of  particular  colors  or  groups  of 
colors  is  called  selective  absorption.  A  glass  which  absorbs  equal  proportions 
of  all  colors  of  light  is  called  a  neutral  glass.  It  serves  the  purpose  of  reducing 
the  intensity  of  light  without  altering  its  color. 

Since  absorbed  light  is  entirely  lost,  the  color  of  a  piece  of  glass  will  be 
determined  by  the  colors  of  light  transmitted  by  it.  If  one  looks  at  an  object 
through  a  colored  glass  and  the  object  gives  off  light  only  of  the  colors  absorbed 
by  the  glass  and  in  the  proportions  absorbed,  the  object  will  appear  black. 
If  the  object  gives  off  light  only  of  the  colors  transmitted  by  the  glass  and  in 
the  same  proportions  as  transmitted,  there  will  be  no  change  in  the  color  of 
the  object.  If  the  object  gives  off  light,  some  of  which  is  absorbed  and  some 
of  which  is  transmitted  by  the  glass,  the  object  will  seem  to  have  only  the 
colors  transmitted  by  the  glass. 

If  for  any  reason  it  is  desired  to  suppress  any  particular  color  or  colors  of 

light  in  any  proportions,  it  is  necessary  only  to  pass  the  light  through  a  glass, 

the  intrinsic  absorption  of  which  is  in  keeping  with  the  requirements      We 

have  prepared  charts  showing  the  relative  intrinsic  absorption  of  visible  light 

of  the  colored  glasses  commonly  used  for  ophthalmic  lenses.     The  height  of 

the  rectangle  represents  100%,  and  the  vertical  lines  indicate  the  various 

colors  of  the  spectrum — red,  yellow,  green,  blue  and  violet.     The  portions  of 

the  vertical  lines  below  the  curve  indicate  absorbed  light,  and  those  above 

indicate  transmitted  light.  Thus, for  example,  the  absorptions  for  Euphos  A  are : 

Red 32.4%  Green.    .    .    .     3.8%  Violet.    .    .    .   41.5% 

Yellow    .    .    .     8.8%  Blue    ....   25.0% 

The  transmission  for  each  color  is,  of  course,  100%,  minus  the  per  cent  of 
absorption  for  the  color  under  consideration. 

26 


COLOR   AND   ABSORPTION   CHART— I 


100% 


Crookes  a 


Crookes  B 


100% 


EuPHOS  A 


EUPHOS   B 


lOCo 


Y        G  B       V 


NoviOL  A 


NoviOL  B 


NOVIOL  C 


COLOR   AND   ABSORPTION  CHART— II 


B 


90  - 
80  - 
70  — 
60  - 
50  - 
40  — 
30  — 
20  —  *■ 
10  — 
0  — L 


FlEUZAL  A 


FlEUZAL  B 


70 
60 
50 
40 
30 
20 
10 
0 


-  90 
80 
70 
60 
50 
40 
30 
20 
10 
0 


R               Y 

G           B        V 

90    - 

- 

80    - 

*- 

- 

70    - 

- 

60    - 

y 

- 

50    - 

y^ 

- 

40    - 

.^ 

- 

30    - 

- 

20    - 

y 

- 

10    _ 
0    _ 

;^ 

mM 

— 

IOO''i 
90 
80 
70 
60 
50 
40 
30 
20 
10 
0 


Amber  A 


Amber  B 


100° 
90 
80 
70 
60 
50 
40 
30 
20 
10 
0 


B 


1 00% 
f—  90 

80 
70 
60 
50 
40 
30 
20 
10 
0 


100° 
90 
80 
70 
60 
50 
40 
30 
20 
10 
0 


R                Y        G           B       V 

^ 

/" 

- 

- 

- 

- 

1 00% 
90 
80 
70 
60 
50 
40 
30 
20 
10 
0 


Amethyst  A 


Amethyst  B 


COLOR   AND   ABSORPTION    CHART— III 


B 


■100% 

■  90 

■  80 
•    70 


40 
30 
20 
10 
0 


Smoke  A 


Smoke  B 


n 

|— 100% 
—  90 

100% 
90 

y 

-  80 

80 

y 

—  70 

70 

-  60 

-  50 

60 
50 

—  40 

40 

1 

—  30 

—  20 

30 
20 

_  10 

10 

s 

MOK 

E  C 

Smoke  D 


Y        G  B       V 


Blue  A 


Blue  B 


R       Y    G     B    V 

90  — 

- 

80  - 

r 

— 

70  - 

f 

V 

- 

60  — 

1 

\ 

— 

50  — 

1 

\ 

— 

40  — 

. 

' 

\ 

— 

30  — 

V 

— 

20  — 

r>v^ 

:^  :•:-•■. -•■■■■  ■ 

- 

10  — 
0  — 

M^ 

\v;vv.:.  ,■.,■,•.:;■■,■:■■■■. ;-■ 

,v.\o.:  „.:■;.:  :v. 

»o,,.-,,.,  ;a^x 

r 

■ 

I 

100% 
90 
80 
70 
60 
50 
40 
30 
20 
10 
0 


Blue  C 


Blue  D 


B     A     U      H      C      II  &  L      O      M      I!       /^^        ()     I"    T     I     C     A     L  ('    ()     M     I'    A     X    Y 


The  colors  and  sliadfs  adopled  for  ()|)lillialiiiic  lenses  lia\-e  Ix-en  eonlined 
to  a  rano-e  of  sufficient  latitude  lo  answer  a  i;i-eal  vaiielv  of  pniposes.  It 
will  he  an  easy  task,  therefore,  hy  reference  lo  Ihe  charl,  to  select  the  one 
ineetinij;  the  necessary  re(|uirenients. 

Crookes  glass  is  of  a  neuli-al  color  and  is  sn|)[)lie(l  in  two  shades;  the 
light  shade  is  so  colorless  as  to  aj)i)ear  almost  like  while  glass,  while  the  darker 
tint  absorbs  the  same  amount  of  ultra-violet  and  heal  rays  as  the  light  tint. 
This  glass  owes  its  origin  to  Sir  William  Crookes,  who  conducted  the  exj)eri- 
ments  for  a  glass  to  overcome  the  heat  and  ultra-violet  ravs. 

Euphos  glass  is  the  result  of  scientific  investigations  conducted  bv  Dr. 
Schanz,  of  Dresden.  It  is  of  a  greenish  tint  in  two  shades  and  designed  for 
use  wherever  it  is  desirable  to  eliminate  the  ultra-violet  rays  entirely,  espe- 
ciall}-  for  work  under  powerful  arc  lamps  and  any  other  high-power  illuminants. 

Noviol  is  a  new  glass  of  a  very  brilliant  yellow  tint  in  three  shades.  It 
affords  the  eye  absolute  [protection  against  the  ultra-violet,  violet  and  blue 
rays  and  at  the  same  time  absorbs  a  large  percentage  of  the  infra  red  rays. 
It  does  not  show  an  appreciable  absorj)tion  of  the  rest  of  the  sj)ectrum  and  on 
that  account  permits  a  clear  vision  both  of  near  and  distant  ol)jects. 

Fieuzal  glass  is  the  result  of  research  work  on  the  part  of  Dr.  Fieuzal,  of 
Paris.  The  glass  has  a  greenish  yellow  tint  and,  as  the  respective  curve  in  the  color 
chart  will  show,  will  serve  an  admirable  purpose,  in  the  lighter  shade,  for  comfort 
in  motoring,  boating,  etc.,  without  changing  the  natural  appearance  of  land- 
scapes, and  in  the  darker  shade,  where  it  is  desired  to  check  the  ultra-violet  rays. 

Amber  glass  has  come  into  popular  favor  in  recent  years.  It  has  limited 
absorptive  properties  but  is  very  useful  in  motoring  and  where  it  is  designed 
to  tone  down  the  color  of  light  for  numerous  other  outdoor  occupations.  It 
is  made  in  two  shades. 

Amethyst  has  a  limited  demand  but  is  preferred  by  some  optometrists 
and  o})ticians,  and  we  supply  it  in  the  two  shades  given  in  our  color  chart. 

Smoke,  a  neutral  tint  of  four  shades,  has  been  found  by  experiment  to 
accomj)lish  the  result  of  moderating  the  light  satisfactorily  ant!  it  is  recom- 
mended, therefore,  for  general  use. 

Blue  glass  is  still  preferred  by  many  and  is  also  offered  in  four  shades. 
It  serves  many  purposes,  particularly  for  use  at  the  sea  shore. 

The  following  pages  will  illustrate  the  standard  sizes  in  which  the  various 
kinds  of  colored  glass  are  regularly  supplied.  To  insure  correct  focal  results, 
wherever  our  tools  are  employed,  only  the  glass  herein  mentioned  should  be 
used.  An  allowance  for  matching  shades  will  have  to  be  made,  as  glass  manu- 
facturers find  it  impossible  to  duplicate  colored  glass  exactly  in  shade. 


27 


B    A    U     S     C     II  &  LOME       /M^!SSx        OPTICAL  COMPANY 


SIZES   OF  FLAT   OPTICAL   GLASS   BLANKS 

OVAL  AND  SQUARE 


R     .\     IT      S      C      II 


L     O     M     n 


O     1>    T    I    (•    .\    L 


•  '    O    M     I'    A     N    Y 


PRICES   FOR 
FLAT  OPTICAL  GLASS   BLANKS 

OVAL  AND   SQUARE 


OVAL 

SQUARE 

'' 

Per  Dozen  Pairs 

A 

B 

C 

D 

A 

B 

C 

D 

45  X  35.5 

50x40 

60x50 

70x60 

42 

47 

51 

63 

mm 

mm 

mm 

mm 

mm 

mm 

mm 

mm 

White 

Crow^n 

2  to  2 . 5  1 

$0 .  50 

$0.75 

$1.00 

$1.50 

$0.50 

$0.75 

$1.00 

$2 .  50 

3  to  4       I  mm  thick 

0.75 

1.00 

1.50 

2.00 

0.75 

1.00 

1 .  50 

;5.()() 

5  to  7      J 

1.00 

1.50 

2.00 

3.00 

1.00 

1.50 

2.00 

4.00 

Roentgen 

iS^' }-"«." 

2.25 

2.50 

5.00 

2.50 

3.00 

2.50 

3.00 

6.00 

3.00 

4.00 

Colored 

Smoke 

2  to  2.5  ] 

0.75 

1.00 

1.50 

2.00 

0.75 

1.00 

1.50 

3.50 

3  to  4      [  mm  thick 

1.00 

1.50 

2.00 

3.00 

1.00 

1.50 

2.00 

4.25 

5  to  7      j 

1.50 

2.00 

3.00 

4.25 

1.50 

2.00 

3.00 

5.75 

Blue 

2  to  2.5  1 

0.75 

1.00 

1.50 

2.00 

0.75 

1.00 

1.50 

3.50 

3  to  4         mm  thick 
5  to  7      j 

1.00 

1.50 

2.00 

3.00 

1.00 

1.50 

2.00 

4.25 

1.50 

2.00 

3.00 

4.25 

1.50 

2.00 

3.00 

5.75 

Amber 

2  to  2 . 5  ) 

0.90 

1.30 

1.75 

2.50 

0.90 

1.30 

1.75 

4.50 

3  to  4       \  mm  thick 

1.30 

1.75 

2.50 

3.50 

1.30 

1.75 

2.50 

5.25 

5  to  7      J 

1.75 

2.50 

3.50 

5.25 

1.75 

2.50 

3.50 

7.00 

Amethyst 

2  to  2.5  1 

1.00 

1.50 

2.00 

3.00 

1.00 

1.50 

2.00 

5.00 

3  to  4       >  mm  thick 
5  to  7      J 

1.50 

2.00 

3.00 

4.00 

1.50 

2.00 

3.00 

6.00 

2.00 

3.00 

4.00 

6.00 

2.00 

3.00 

4.00 

8.00 

Fieuza! 

2  to  2 . 5  ] 

1.00 

1.50 

2.00 

3.00 

1.00 

1.50 

2.00 

5.00 

3  to  4      >  mm  thick 

1.50 

2.00 

3.00 

4.00 

1.50 

2.00 

3.00 

6.00 

5  to  7      i 

2.00 

3.00 

4.00 

6.00 

2.00 

3.00 

4.00 

8.00 

Per  Pair 

A 

B 

C 

D 

A 

B 

C 

D 

Euphos 

2  to  2 . 5  1 

$0.50 

3  to  4      >  mm  thick 

0.60 

5  to  7     j 

0.75 

Noviol 

2  to  6  mm  thick 

1.50 

29 


n   A   u    s    c    n        &        L    o    M    u     /^^s^     optical        company 


SIZES   OF   FLAT   OPTICAL   GLASS   BLANKS 

ROUND 


30 


R     A     U      S     C      IT 


L     O      M      I! 


<)    I'    T    I    r    .\    L 


(■    ()    M     !•    .\     X    Y 


PRICES   FOR 
FLAT   OPTICAL  GLASS   BLANKS 

ROUND 


A 

R 

C 

51 
mm 

D 

57 
mm 

E 

63 
mm 

F 

G 

42 
mm 

47 
mm 

71 
mm 

8U 
mm 

White 

Cro-vs^n 

2  to  2.5  1 

3  to  4       [  mm  thick 
5  to  7      j 

$0.50 
0.75 
1.00 

$0.75 
1.00 
1.50 

$1.00 
1.50 
2.00 

$1.75 
2.25 
3 .  00 

$2.50 
3 .  00 
4.00 

$3.25 
4 .  00 
5.00 

$4.00 
5.00 
6.00 

Roentgen 

2  to  2.5  1           ,,  .  , 

3  to  4       )  '"•"  *'"^'^ 

2.50 
3.00 

Colored 

Smoke 

2  to  2.5  1 

3  to  4      V  mm  thick 
5  to  7      j 

0.75 
1.00 
1.50 

1.00 
1.50 
2.00 

1.50 
2.00 
3.00 

2.50 
3.25 
4.25 

3.50 
4.25 
5.50 

4.50 
5.50 
7.00 

5.50 
7.00 
8.50 

Blue 

2  to  2.5] 

3  to  4       \  mm  thick 
5  to  7      J 

0.75 
1.00 
1.50 

1.00 
1.50 
2.00 

1.50 
2.00 
3.00 

2.50 
3.25 
4.25 

3.50 
4.25 
5.50 

4.50 
5.50 
7.00 

5.50 
7.00 
8.50 

Amber 

2  to  2.5  1 

3  to  4       [  mm  thick 
5  to  7      i 

0.90 
1.30 
1.75 

1.30 
1.75 

2.50 

1.75 

2.50 
3.50 

3.00 
4.00 
5.25 

4.50 
5.25 
7.00 

5.75 
7.00 

8.75 

7.00 

8.75 

10.50 

Ameth>st 

2  to  2 . 5  j 

3  to  4       [  mm  thick 
5  to  7      j 

1.00 
1  50 
2.00 

1.50 
2.00 
3.00 

2.00 
3.00 
4.00 

3.50 
4.50 
6.00 

5.00 
6.00 
8.00 

6.50 

8.00 

10.00 

8.00 
10.00 
12.00 

Fieuzal 

2  to  2 . 5  1 

3  to  4       [  mm  thick 
5  to  7      J 

1.00 
1.50 
2.00 

1.50 
2.00 
3.00 

2.00 
3.00 
4.00 

C 

3.50 
4.50 
6.00 

5.00 
6.00 
8.00 

6 .  50 

S.OO 

10.00 

8.00 
10.00 
12.00 

Per  Pair 

A 

B 

D 

E 

F 

G 

Euphos 

2  to  2.5  1 

3  to  4       ;-  mm  thick 
5  to  7      j 

$0.40 
0.45 
0.50 

Crookes 

2  to  2  . 5  ) 

3  to  4       •  mm  thick 
5  to  7      j 

0.45 
O.GO 
1.00 

Noviol 
2  to  6  mm  thick 

1.20 

31 


B     A     U      S     C      ri  &  L     O     M      n      /^^^%\       OPTICAL  COMPANY 


SIZES   OF  MOULDED   OPTICAL  GLASS   BLANKS 

ROUND 


32 


n     A     U      S     C      H  &  L     O     M      n       /^Sa»\        OPTICAL  ('    o    M     I'    A     X    Y 


PRICES   FOR 
MOULDED   OPTICAL   GLASS   BLANKS 

ROUND,  6.00    AND   9.00   CURVE 


A 

B 

C 

D 

E 

F 

Per  Dozen  Pairs 

47 

51 

57 

63 

71 

80 

mm 

mm 

mm 

mm 

mm 

mm 

White 

6.00  Curve 

Crown 

2  to  2.5  1 

3  to  4       -  mm  thick 
5  to  7      J 

$1.25 

$1.50 

$2.00 

$2.75 

$3.75 

$5.00 

1.50 

2.00 

2.50 

3.25 

4.50 

6.00 

2.00 

2.50 

3.00 

4.25 

5.50 

7.00 

Roentgen 

2  to  2  . 5  1             . ,  .  , 

3  to  4      )  ™"^  *'"^'^ 

4.00 
5.00 

9.00  Curve 

Crown 

2  to  2 . 5  1 

3  to  4       r  mm  thick 
5  to  7      j 

2.00 

2.50 

3.00 

2.25 

3.00 

4.00 

2.75 

3.75 

5.00 

Colored 

6.00  Curve 

Smoke 

2  to  2.5  1 

3  to  4       V  mm  tliick 
5  to  7      J 

1.75 

2.00 

2.75 

4.00 

5.25 

7.00 

2.00 

2.75 

3.50 

4.75 

6.25 

8.50 

2.75 

3.50 

4.25 

6.00 

7.75 

9.75 

Blue 

2  to  2.5] 

1.75 

2.00 

2.75 

4.00 

5.25 

7.00 

3  to  4       \  mm  thick 

2.00 

2.75 

3.50 

4.75 

6.25 

8.50 

5  to  7      J 

2.75 

3.50 

4.25 

G.OO 

7.75 

9.75 

Amber 

2  to  2.5] 

2.25 

2.50 

3.50 

4.75 

6.50 

8.75 

3  to  4       \  mm  thick 

2.50 

3.50 

4.50 

5.75 

8.00 

10.50 

5  to  7      ) 

3.50 

4.50 

5.25 

7.50 

9.75 

12.25 

Amethvst 

2  to  2 . 5  1 

2.50 

3.00 

4.00 

5.50 

7.50 

10.00 

3  to  4       -  mm  thick 
5  to  7      j 

3.00 

4.00 

5.00 

6.50 

9.00 

12.00 

4.00 

5.00 

6.00 

8.50 

11.00 

14.00 

Fieuzal 

2  to  2.5  1 

2.50 

3.00 

4.00 

5.50 

7.50 

10.00 

3  to  4       \  mm  tliick 

3.00 

4.00 

5.00 

6.50 

9.00 

12.00 

5  to  7      ) 

4.00 

5.00 

6.00 

8.50 

11.00 

14.00 

Per  Pair 

A 

B 

C 

D 

E 

F 

Euphos 

6.00  Curve 

2  to  2.5] 

3  to  4       •  mm  thick 
5  to  7      j 

$0.50 

0.60 

0.75 

Crookes 

6.00  Curve 

2  to  2.5  ] 

3  to  4      \  ram  thick 
5  to  7      ) 

0.60 

0.75 

1.15 

Noviol 

6.00  Curve 

2  to  6  mm  thick 

1.20 

33 


REPRODUCTION  OF  OPHTHALMIC  LENS   CHART 


DIAGRAMS  SHOWING  USEFUL  FIELD  OF  VIEW 


.q-;;-',;: 


of  different  Types  of  +  8  D  Ophthalmic  Lenses 


DOUBLE  CONVEX 

USEFUL  FIELD  16 


<D 


OBJECT 


IMAGE 


PERISCOPICCONVEX 

USEFUL  FIELD  21 


OBJECT 


IMAGE 


MENISCUS  CONVEX 

USEFUL  FIELD  52 


OBJECT 


IMAGE 


m    BAUSCH  &  LOMB  OPTICAL  CO. 


ROCHESTER,  N.  Y. 


34 


L     O     M     I! 


OPTICAL 


C    O    M    P    A    N    Y 


DESCRIPTION   OF   OPHTHALMIC   LENS   CHART 

THE  old  idea  tliat  the  eye  is  a  eaniera  behind  the  eoirecliiit;-  lens  is  not 
regarded  as  coverino;  the  possibilities  of  use  which  llie  eve  niav  make 
of  the  lens  in  front  of  it. 
In  practice  the  eye-ball  rotates  in  the  orbit.  In  reading,  for  exainj)le,  the 
head  is  stationary  and  the  eye  directed  to  varions  ])ai'ts  of  the  held  by  rotating 
it  like  a  ball  in  a  socket;  and  since  the  frame  of  the  glasses  is  in  a  fixed  relation 
to  the  head,  the  eyes  will  use  ditferent  portions  of  the  lens.  It  is  thus  apparent 
that  the  correction  of  the  refraction  of  an  eye,  when  directed  straight  forward, 
is  only  a  small  part  of  the  functions  of  a  perfect  eye  lens. 

The  point  about  which  the  eye-ball  rotates,  the  center  of  rotation,  is  called 
C  in  the  following  diagram.  It  is  located  about  lo  mm  back  of  the  cornea 
and  consequently  about  '27  nun  back  of  the  eye  lens. 


Fig.  1 


Fig.  2 


With  the  eye,  of  course,  rotate  the  near  point  and  the  far  point,  and  they 
will  always  lie  on  spheres  with  C  as  center.  The  figures  show  these  spheres 
for  a  myopic  and  a  hyperopic  eye.  The  axis  of  all  the  pencils  of  light  coming 
from  various  objects,  upon  wdiich  the  eye  may  be  fixed,  go  through  C.  The 
width  of  these  pencils  is  determined  by  the  diameter  of  the  pupil,  and  it  is 
apparent  from  the  figures  that  the  pupil  in  its  various  positions  can  be  replaced 
by  one  imaginary  diaphragm  of  about  the  width  of  the  pupil  and  located  in  C. 

The  ideal  lens  should  image  any  far  object  within  the  reacii  of  the  eye  on 
the  far  point  sphere,  so  that  no  matter  in  what  direction  the  eye  looks  it  will 
always  see  objects  undistorted  and  with  the  same  sharpness  of  definition  as  in 
the  case  of  objects  near  the  center  of  the  field. 

The  chart  on  page  34  shows  how  much  the  performance  of  a  double  convex, 
periscopic  and  a  meniscus  convex  lens  differ  from  the  ideal  lens.  The  dia- 
grams prove  strikingly  tliat  the  meniscus  lens  oft'ers  the  greatest  area  of  field. 

For  a  complete  treatise  upon  this  chart,  attention  is  called  to  our  pamphlet 
"The  Eye  and  the  Lens,"  No.  1  of  our  "Scientific  and  Technical  Pul)lications." 
(See  page  147.) 


35 


n   A    u    s    c    II 


L    o    M    n 


OPTICAL 


COMPANY 


A  FEW   FACTS   ABOUT  VERTEX   REFRACTION 

A  DEFECTIVE  evc  is  coiTectecl  for  distant  vision  by  that  lens  which  forms 
an  image  of  a  distant  oliject  in  the  Pnnctum  Remotum  of  the  eye. 
The  Ejeneral  practice  of  optometry  has  so  far  not  proceeded  accord- 
in<i-  to  this  principle  but  has  indiscriminately  used  lenses  of  any  form  for 
correction  of  any  eye,  as  long  as  they  were  of  the  same  power.  This  is  wrong, 
since  lenses  of  the  same  power,  but  of  different  shape,  have  not  the  same 
back  focus,  consequently  do  not  form  the  image  of  a  far  distant  object  at  the 
same  distance  from  the  rear  surface,  and  are  therefore  not  interchangeal)le. 
The  diagrams  l>elo\v  show  a  double  convex  and  a  meniscus  convex  lens  in 
front  of  the  eye,  both  of  the  same  power  but  the  meniscus  lens  over-correcting 
— stronirer  than  the  flat  since  in  the  meniscus  lens  the  l)ack  focus,  "b,"  is 
shorter  than  the  back  focus  of  the  flat  lens. 


Therefore,  the  present  way  of  designating  the  [)ower  of  lenses  by  reciprocals 
of  focal  length  is  not  correct,  because  it  measures  something  which  is  really 
of  no  value  to  the  proper  performance  of  the  Urns. 

The  power  of  a  lens,  up  to  the  present  time,  has  been  measured  by  com- 
paring it  with  that  of  a  lens  of  the  same  power  but  opposite  sign,  i.  e. — by 
neutralization. 

This  method  again  is  incorrect,  since  it  can  be  shown  that  Iwo  lenses  of 


36 


L     O     M     R       /<!^S^       OPTICAL  COMPANY 


the  same  power  hul  of  (lilVcreiil  ,sli;ii)(>  (•jiiinol  \>r  nciilnilizcd  l)v  one  Iciis  of 
the  opposite  sion.  The  present  numner  of  designalino'  the  j)()wer  of  llic 
lenses,  as  well  as  the  method  of  measuring  this  ])ower,  nvv,  Iherefore,  not 
defendable. 

A  new  and  very  simple  method  has  been  su<;i;ested  liv  Dr.  M.  von  Rohr  in 
his  book,  "Das  Auo-e  und  die  Brille."  He  proposes  to  use  the  reciprocal  of 
the  distance  from  focal  point  to  lens  surface  (the  back  focus)  as  measure  for 
the  effective  power  of  the  lens  and  calls  the  power  thus  defined  "lirillenscheitcl 
Refraction" — in  English,  "Vertex  Refraction."  We  have  adopted  this 
system  for  all  Punktal  and  Katral  series  and  use  for  it  the  symbol  Dy. 

To  enable  the  transforming  of  the  present  system  (D),  which  we  are  still 
using  in  all  flat,  periscopic  and  meniscus  lenses,  into  vertex  diopters  (Dy), 
we  are  showing  a  compensation  table  on  the  following  page. 

The  table  gives  the  powers  in  vertex  diopters  for  the  flat,  periscopic  and 
meniscus  lenses.  The  vertical  column  at  the  extreme  left  is  a  reference  scale 
of  focus  numbers  in  ordinary  diopters.  Under  the  name  of  each  type  of  lens 
are  two  columns;  the  figures  in  the  first  of  these  are  the  powers,  expressed  in 
vertex  diopters  (Dy),  of  lenses  whose  powers,  according  to  the  present  system 
of  numbering,  are  given  by  the  figures  appearing  in  the  reference  scale  at  the 
left.  The  figures  in  the  second  column,  under  the  heading  "Substitute,"  give 
the  power  of  lenses  (present  system  of  numbering)  which  should  be  used  to 
provide,  as  nearly  as  possible,  vertex  refraction  corresponding  to  the  figures 
in  the  reference  scale.  These  results  will  be  approximate,  but  until  lenses 
are  made  to  conform  exactly  to  the  vertex  diopter  system  (Dy),the  table  of 
correction  is  made  to  under-correct  rather  than  over-correct  the  difference. 

For  instance,  if  a  5.00  D  double  convex  lens  is  found  to  correct  an  eye  and 
it  is  desired  to  use  a  meniscus  lens,  find  first  the  figure  5.00  in  the  scale  at  the 
left.  In  the  same  horizontal  line  in  the  second  column  under  meniscus  convex, 
we  find  4.75  D.  This  is  the  number  of  the  meniscus  lens  which  will  give 
correction  nearest  to  that  of  the  5.00  D  double  convex. 

A  complete  treatise  on  this  subject  of  Vertex  Refraction  will  be  found  in 
our  pamphlet,  "The  Substitution  of  Meniscus  for  Flat  Oj)hfhalmic  Lenses 
and  a  New  System  of  Designating  their  Powers,"  No.  '2  of  our  "Scientific  and 
Technical  Publications."  (See  page  147.) 


37 


B     A     U     S     C      II  &  L     O     M      n      /^^^\       OPTICAL  C    O    M    P    A    N    Y 


COMPENSATION  TABLE 

CONVERTING  ORDINARY   DIOPTERS    (D)    INTO  VERTEX 
DIOPTERS    (Dv) 


DOUBLE 

PERISCOPIG 

MENISCUS 

D 

Convex 

Concave 

Convex 

Concave 

Convex 

Concave 

r) 

Substi- 

D„ 

Substi- 

D,, 

Substi- 

D„ 

Substi- 

D„ 

Substi- 

D., 

Substi- 

LJ-y 

tute 

t-'Y 

tute 

i^V 

tute 

V 

tute 

i-'y 

tute 

^^v 

tute 

0.12 

0.12 

0.12 

0.12 

0.12 

0.13 

0.12 

0.12 

0.12 

0.13 

0.12 

0.13 

0.12 

0.25 

0.25 

0.25 

0.25 

0.25 

0.25 

0.25 

0.25 

0 .  25 

0.25 

0.25 

0.20 

0.25 

0.37 

0.37 

0.37 

0.37 

0.37 

0.37 

0.37 

0.37 

0.37 

0.37 

0.37 

0.38 

0.37 

0.50 

0.50 

0.50 

0.50 

0.50 

0.50 

0.50 

0.50 

0.50 

0.50 

0.50 

0.51 

0.50 

0.62 

0.62 

0.62 

0.02 

0.62 

0.62 

0.62 

0.62 

0.62 

0.63 

0.62 

0.63 

0.62 

0.75 

0.75 

0.75 

0.75 

0.75 

0.75 

0.75 

0.75 

0.75 

0.76 

0.75 

0.76 

0.75 

0.87 

0.86 

0.87 

0.86 

0.87 

0.86 

0.87 

0.86 

0,87 

0.88 

0.87 

0.88 

0.87 

1.00 

0.99 

1.00 

0.99 

1.00 

0.99 

1.00 

0.99 

1.00 

1.02 

1.00 

1.02 

1.00 

1.12 

1.11 

1.12 

1.11 

1.12 

1.11 

1.12 

1.11 

1.12 

1.14 

1.12 

1.14 

1.12 

1.25 

1.23 

1.25 

1.23 

1.25 

1.24 

1.25 

1.23 

1.25 

1.27 

1.25 

1.28 

1.25 

1.37 

1.35 

1.37 

1.35 

1.37 

1.36 

1.37 

1.35 

1.37 

1.39 

1.37 

1.40 

1.37 

1.50 

1.48 

1.50 

1.48 

1.50 

1.49 

1.50 

1.48 

1.50 

1.52 

1.50 

1.54 

1.50 

1.62 

1.60 

1.02 

1.60 

1.62 

1.61 

1.62 

1.00 

1.62 

1.65 

1.62 

1.67 

1.62 

1.75 

1.73 

1.75 

1.73 

1.75 

1.74 

1.75 

1.73 

1.75 

1.78 

1.75 

1.80 

1.75 

2.00 

1.98 

2.00 

1.98 

2.00 

1.99 

2.00 

1.97 

2.00 

2.04 

2.00 

2.06 

2.00 

2.25 

2.22 

2.25 

2.22 

2.25 

2.24 

2.25 

2.22 

2.25 

2.29 

2.25 

2.29 

2.25 

2.50 

2.47 

2.50 

2.47 

2.50 

2.49 

2.50 

2.47 

2.50 

2.55 

2.50 

2.55 

2.50 

2.75 

2.72 

2.75 

2.72 

2.75 

2.74 

2.75 

2.71 

2,75 

2.82 

2.75 

2.80 

2.75 

3.00 

2.96 

3.00 

2.95 

3.00 

2.99 

3.00 

2.9() 

3.00 

3.09 

3.00 

3.06 

3.00 

3.25 

3.21 

3.25 

3.20 

3.25 

3.24 

3.25 

3.20 

3.25 

3.34 

3.25 

3.31 

3.25 

3.50 

3.46 

3.50 

3.45 

3.50 

3.49 

3.50 

3.45 

3.50 

3.60 

3.50 

3.57 

3.50 

3.75 

3.71 

3.75 

3.70 

3.75 

3.74 

3.75 

3.70 

3.75 

3.85 

3 .  50 

3.82 

3.75 

4.00 

3.95 

4.00 

3.95 

4.00 

4.00 

4.00 

3.95 

4.00 

4.13 

3.75 

4.07 

4.00 

4.25 

4.20 

4.25 

4.20 

4.25 

4.25 

4.25 

4.20 

4.25 

4.39 

4,00 

4.33 

4.00 

4.50 

4.45 

4.50 

4.44 

4.50 

4.50 

4.50 

4.44 

4.50 

4.65 

4,25 

4.58 

4.25 

4.75 

4.70 

4.75 

4.68 

4.75 

4.75 

4.75 

4.69 

4.75 

4.92 

4.50 

4.84 

4.50 

5.00 

4.95 

5.00 

4.93 

5.00 

5.00 

5.00 

4.93 

5.01 

5.19 

4.75 

5.09 

4.75 

5.25 

5.19 

5.25 

5.18 

5.25 

5.27 

5.25 

5.18 

5.25 

5.45 

5.00 

5.35 

5.00 

5.50 

5.44 

5.50 

5.43 

5.50 

5.52 

5.50 

5.43 

5.50 

5.71 

5.25 

5.01 

5.25 

5.75 

5.69 

5.75 

5.67 

5.75 

5.78 

5 .  75 

5.67 

5.75 

5.99 

5.50 

5.86 

5.50 

6.00 

5.94 

6.00 

5.92 

6.00 

6.04 

6.00 

5.92 

6.00 

6.28 

5.75 

6.11 

5.75 

6.50 

6.44 

6.50 

6.41 

6.50 

6.55 

6 .  50 

6.41 

6.50 

6.81 

6.00 

6.63 

6.50 

7.00 

6.94 

7.00 

6.90 

7.00 

7.09 

7.00 

6.91 

7.00 

7.38 

6.50 

7.14 

7.00 

7.50 

7.44 

7.50 

7.40 

7.50 

7.60 

7.50 

7.40 

7.50 

7.93 

7.00 

7.65 

7 .  50 

8.00 

7.94 

8.00      7.89 

8.00 

8.14 

8.00 

7.89 

8.00 

8.52 

7.50 

8.16 

8.00 

8.50 

8.44 

8 .  50 

8.38 

8.50 

8.65 

8.50 

8.38 

8.50 

9.00 

8.94 

9.00 

8.87 

9.00 

9.18 

9.00 

8.88 

9.00 

9.50 

9.44 

9.50 

9.37 

9.50 

9.72 

9.00 

9. 37 

9.50 

10.00 

9.94 

10.00     9.86 

10.00 

10.29 

9.50 

9.87 

10.00 

10.50 

10.46 

10.50    10.35 

10.50 

10.81 

10.00 

10.36    10.50 

11.00 

10.96 

11.00    10.S4: 11.00 

11.35 

11.00 

10.84    11.00 

12.00 

11.97 

12.00    11. S3    12.00 

12.47 

12.00 

11.84(12.00 

13.00 

12.99 

13.00    12.S2    13.00 

13.61 

12.00 

12.83    13.00 

14.00 

14.01 

14.00    13. SO    14.00 

14.76 

13.00 

13.79    14.00 

15.00 

15.04 

15.00    14.77 

15.00 

15.99 

14.00 

14.S1I  15.00 

in.oo 

16.09 

16.00   15.77 

16.00 

17.25 

15.00 

15.80    16.00 

is.oo 

18.18 

18.00    17.72 

18.00 

19.93 

16.00 

17.78 

18.00 

20.00 

20.34 

20.00   19.69 

20.00 

22.86 

18.00 

19.74 

20.00 

38 


L     O     M      15       /V-S!!SS\        O     I'    T    1     (■    A     L  CO    M     I'    A     \    Y 


OPHTHALMIC    LENSES 

WITH  a  defiiiilc  knowledge  of  [\\c  rolraclivc  and  disj)(M"si\('  properties 
t)f  glass,  our  Scieulific  liviroau  c'oni])ul(\s  llie  roniuilie,  i.  e.,  llie  radii 
for  both  sides  of  the  lens  and  the  ceiilei'  thickness  to  which  all 
focused  lenses  are  to  be  ground.  These  fornud;e  having  been  accepted  and 
tools  and  gauges  made  to  conform  thereto,  it  becomes  the  work  of  the  opera- 
tives to  maintain  carefully,  by  constant  gauging,  the  coi-rcct  curvatui-e  of  the 
tools.  A  set  of  master  gauges  is  approved  by  the  Bureau,  and  all  tools  and 
gauges  used  in  the  various  stages  of  manufacture  are  kept  true  to  curves  by 
comparison  with  this  set. 

In  the  manufacture  of  ophthalmic  lenses  science  and  skill  have  enabled  us 
to  achieve  results  which  have  made  the  slogan.  Bausch  &  J^OMU  (Quality, 
svnonymous  with  the  best  in  lens  numufacture.  Our  lenses  are  sold  in  every 
country  in  the  world  and  arc  universally  recognized  as  representing  the 
highest  achievement  of  the  optician's  art. 

For  more  than  sixty  years,  Bausch  &  Lomb  Quality  has  been  the  quality 
above  all  others  to  which  lens  manufacturers  have  aspired,  and  while  our 
early  efforts  were  crude  compared  to  our  {)resent  day  standards,  we  have 
always  allied  ourselves  closely  with  the  advancement  of  the  industry.  Every 
detail  is  constantly  under  our  direct  supervision,  and  every  known  device  is 
utilized  to  maintain  the  greatest  possible  accuracy. 

We  began  the  production  of  lenses  with  the  j)lano  and  double  convex  and 
concave  forms,  to  which  were  added  the  periscopic  and  later  the  deeper 
curved  and  other  types.  Our  records  show  that  we  began  the  production  of 
ophthalmic  lenses  for  the  general  market  in  1878,  but  much  earlier  for  our 
own  consumption.  From  a  few  types  of  lenses  were  developed  a  complete 
line  adequate  to  meet  any  demand  of  the  oculist,  o})tometrist  and  optician. 

All  our  computations  are  based  on  the  metric  system  of  measurement,  the 
unit  of  which  is  the  diopter.  The  power  of  a  lens  is  expressed  by  the  recii>rocal 
of  the  focal  length,  or  1  divided  by  the  focal  length.  Tiie  longer  the  focal 
length,  the  weaker  the  power;  the  shorter,  the  stronger.  Power  is  designated 
by  reference  to  the  unit,  the  diopter.  A  lens  of  one  meter  focus  has  a  power 
of  1  /I  D ;    of  ^2  meters,  1  /2  1) ;    of  1  /-i  meter,  4  D,  etc. 

To  accommodate  the  demand  for  different  thicknesses  our  uncut  lenses 
(note  exceptions)  are  made  in  Standard  and  Rimless.  The  maxinmm  devia- 
tion from  these  established  thicknesses,  which  is  permitted  in  manufacture,  is 
from  0.2  to  0.4  mm,  according  as  the  focus  of  the  lens  is  strong  or  weak. 
Some  of  the  lower  priced  lenses  are  oval,  large  enough  to  cut  the  usual  run  of 
small  eye  sizes.     We  recommend,  however,  the  47  mm  size,  which  will  permit 

39 


r;     A     U      S     C     II  &  LOME       /0^^       OPTICAL  COMPANY 


cuttiiii;'  nol  only  all  standanl  sizes,  hut  also  cuttintf  to  the  optical  center  of  the 
lens  all  sizes  uj)  to,  and  including,  OOOV  eye.  This  will  be  found  particu- 
larly useful  for  cylinder  combinations. 

AVith  the  introduction  of  the  Punktal  and  Katral  lenses,  to  which  more 
complete  reference  is  made  in  subsequent  pages  of  this  catalog,  it  is  found 
necessary  to  designate  our  various  types  of  ophthalmic  lenses  by  series  on 
account  of  their  varying  properties.  To  distinguish  them  we  have  applied 
trade  names  as  follows : 

Centex — Represents  our  standard  of  production  which  has  given  Bausch 
&  LoAiB  Lenses  the  reputation  they  now  enjoy.  This  series  will  continue  to 
be,  for  some  time  at  least,  the  lens  for  general  use.  In  optical  correction  they 
are  e(|ual  to  the  Primex.but  surface  quality  is  measured  by  our  standard  method, 
and  thickness  is  limited  to  the  variations  given  on  page  4,5.  They  are,  like 
the  Primex  series,  based  on  the  j)resent  system  of  refraction;  that  is  to  say,  the 
convex  and  concave  powers  neutralize  each  other  and  conform  to  the  double 
convex  and  concave  lenses  of  the  trial  case  now  generally  in  use.  The  negative 
powers  are  computed  to  their  exact  diopter  values,  while  the  positive  powers 
are  made  sufficiently  weaker  to  compensate  for  the  difference  in  center  thick- 
ness. Reference  should  be  made  to  the  table  of  stock  foci  on  page  43,  which 
also  shows  the  diiference  in  powers  as  measured  for  vertex  refraction  (Dy)- 

Primex — Rej>resents  a  lens  of  the  best  surface  (juality,  free  from  strain 
and  of  accurate  centration.  Each  lens  is  carefully  tested  for  these  important 
factors;  optical  center  is  indicated,  and  thickness  for  all  foci  selected  to 
accommodate  If  mm  strap  for  00  eye  size.  Lenses  of  this  series  are  made 
47  mm  round,  in  toric  form  only,  (0.00  Base  Curve).  They  are  based  on  the 
(D)  method  of  refraction  and  designed  to  meet  the  demand  for  a  high-grade 
lens,  differing  from  the  Punktal  series  in  the  fact  that  the  marginal  zones  are 
not  so  well  corrected. 

Punktal — Corresponding  to  the  anastigmat  lens  in  the  [)hotographic 
field,  the  Punktal  lens  represents  the  acme  of  o[)hthalmic  lens  production. 
No  base  curve  is  employed,  the  curves  recpiired  to  correct  (>acli  power  being 
computed  separately,  thus  giving  asfigmafic  corrcciion  in  all  poiccra  to  the 
margin  of  the  lens.  Every  surface  is  carefully  tested  for  wavy  irregularities 
and  strain.  Center  is  indicated  with  but  a  small  minimum  of  allowance,  and 
thickness  is  controlled,  for  000  eye,  to  fit  a  If  strap.  These  lenses  are  based 
on  the  vertex  system  of  refraction  (Dy) ,  made  in  toric  form  and  in  foci  up  to, 
and  including,  7.00  Dy  in  plus  and  20.00  Dy  in  minus  ])owers. 

The  positive  and  negative  powers  of  this  series  are  computed  to  their  exact 
diopter  powers,  i.  e.,  they  do  not  neutralize  each  other,  and  in  connection 
therewith  the  trial  case  lenses  made  by  us  and  illustrated  in  our  catalog  of 

40 


B     A     U      S     C      H  &  L     O     M      n        -^^^E^       OPTICAL  COM     V    A    N    T 


Oplillialmic  Apparalus  should  prcffrahly  he  used.  Tlic  onliiiarv  Icsl  It-uses  of 
double  couvex  aud  coucavc  forui,  however,  if  carofullv  couipulcd,  will  serve 
the  purpose  with  small  aud  allowahle  diiVereuces  (see  I'auiphlet  No.  5, 
"Scientific  aud  Technical  Publications").  A  small  reproduction  of  our  trade 
mark,  ^,  is  lightly  engraved  on  the  surface  of  each  lens,  ii(>ar  llie  margin.  A 
more  tletailed  description  of  these  lenses  is  found  on  pages  75  to  77. 

Katral  -  Have  the  same  optical  qualities  as  the  Punktal  but  are  intended 
for  the  correction  of  cataract  cases.  They  are  made  in  all  foci  stronger  than 
7.00  Dy  plus  and  to  order  only.  Each  individual  case  requires  special  formula', 
for  which  detailed  information  is  given  in  subsetjuent  })ages  of  this  catalog. 
(See  page  80.) 

Unibral — Represents  a  new  line  of  colored  focused  lenses  in  which  the 
absorj)tion  is  uniform  over  the  entire  surface  of  the  lens.  They  are  designed 
for  high  grade  optical  work  and  made  exclusively  in  toric  form.  These  lenses 
are  supplied  in  the  Punktal  and  Primex  series  only.  As  previously  stated,  it 
is  not  always  possible  to  match  shades  exactly,  and  we  allow  ourselves 
some  variation  of  shade  either  way. 

In  ordering  our  lenses  it  is  essential  to  specify  "Bausch  &  Lomb"  in  addi- 
tion to  the  designation  representing  the  series  desired. 

On  a  subsequent  page  we  give  illustrations  of  our  lens  labels,  from 
which  the  labeling  of  our  various  grades  may  be  recognized.  All  Uncut 
Lenses  are  packed  in  envelopes  either  singly  or  in  pairs,  except  Piano,  Sphero, 
oval.  Flat  Rough  Cylinders,  Colored,  Piano  and  Rough  Prisms,  Coquille 
and  Mi-Co(juille,  oval.     These  are  packed  in  paper  wrappers. 

As  our  lenses  are  distributed  through  the  wholesale  trade,  they  are  put  up — 
in  their  individual  envelopes  or  wrappers — in  packages  of  so-called  minimum 
quantities,  and  in  these  packages  sold  at  the  regular  dozen  prices.  When 
ordered  in  less  than  minimum  tpiantities,  necessitating  the  breaking  of  pack- 
ages, an  extra  charge  is  made  to  cover  the  cost  of  repacking.  (See  table  of 
minimum  quantities,  pages  46  and  47.) 

For  the  convenience  of  the  trade,  our  lens  containers  and  envelopes  of 
Centex,  Primex,  Punktal  and  Katral  series  are  market!  with  the  foci  accortling 
to  the  system  of  measurement  applying  to  each  series.  As  the  vertex  refrac- 
tion method  seems  certain  to  become  the  stantlard  of  the  future,  the  table  on 
page  138  will  assist  materially  in  determining  the  relative  tlifferences. 

We  offer  a  lens  of  Portex  quality  in  the  Piano,  oval  antl  round,  Periscopic, 
Convex,  oval.  Double  Convex,  oval  and  rountl,  and  Meniscus  Piano. 
Portex  designates  second  choice  of  selection. 


41 


R     A     U      S     C      II  &  LOME       /^^^       OPTICAL  COMPANY 


FACSIMILE  DISPLAY  OF  B.  &  L.  LENS  LABELS 


42 


r,     A     XT      S      C      H 


L    o    M    rs 


O     I'    T    1     C.     A     L 


<)    M     1'    A     N    Y 


PRIMEX   AND   CENTEX  FOCI   AND   CODE 

These  lenses  conform  to  the  oUl  (1))  nielhod  of  refraction,  ilic  vertex  refraction  (I)^.)  Ix-iri^'  f,Mven 
for  comparison  only. 

This  tal)le  specifies  the  foci  rcffularly  carried  in  stock  and  will  serve  as  a  jrnide  in  ordering,'. 

The  following  foci  are  fnrnished  withont  extra  charge,  hnt  only  in  white  Spherical  and  Flat 
Piano-Cylinders  0.G8,  1.87,  2.12,  2.'M,  2.(i2,  2.87,  6.2.5,  6.75. 

Code  for  Spherical  (donhle),  Cylinder  and  Prism,  is  for  white  lenses  finished  on  both  sides,  of 
standard  thickness. 

Add  the  words  Rongh,  Piano,  Periscopic,  Meniscus,  Smoke,  Blue,  Aml)er,  Amethyst,  Fieuzal, 
Crookes,  Noviol,  Eujjhos  or  Rimless  when  such  lenses  are  ordered. 

Use  Sphere  and  Cylinder  code  words  together  for  Sphero-Cylinder  combinations. 

Code  for  Toric  is  for  one  surface,  the  other  surface  to  be  designated  Rough  or  Piano  as  desired. 
If  Sphere,  use  code  word  for  Sphero  focus  wanted. 


SPHERO 

CYLINDER 

TORIC 

D 

+ 

- 

+ 

- 

Cy 

+ 

- 

Dv 

Code 

Dv      Code 

Dv 

Code 

Dv 

Code 

D 

Dv 

Code 

JDv 

Code 

0 
0 
0 

1^ 
25 
37 

0,12 
0,25 
0.37 

Skell 
Skiff 
Skull 

0.12    Search 
0.25   Seam 
0.37!  Script 

0.12 
0.25 
0.37 

Commerce 
Commode 
Common 

0.12 
0.25 
0.37 

Cricket 

Crisis 

Critic 

0.12:  0.13 
0.25    0.25 
0.37    0.37 

Thatch 
Theist 
Thew 

0.13 
0.26 
0.38 

Tub 

Tube 

Tuck 

0 
0 
0 

50 
62 

7^ 

0.50 
0.62 
0.75 

Sketch 
Skout 
Skate 

0.50    Screw 
0 .  62    Screen 
0.75,  Scrap 

0.50 
0.62 
0.74 

Compass 
Complex 
Concern 

0.49 
0.62 
0.74 

Cross 
Crown 

Crumb 

0.50    0.50 
0.62   0.63 
0.75    0.76 

Thing 
Thight 
Thirst 

0.51 
0.63 
0.76 

Tuft 
Tug 
Tulip 

0 

87 
00 
12 

0  86 
0  99 
1.11 

Size 
Sky 
Strip 

0.86 
0.99 
1.11 

Scotch 
Scoop 
Solar 

0.86 
0.99 
1.11 

Cone 

Congress 

Cause 

0.86 
0.99 
1.11 

Crystal 
Culprit 
Coast 

0.87    0.88 
1.00    1.02 
1.12    1.14 

Thack 
Thole 
Thallus 

0.88 
1.02 
1.14 

Tucan 

Tune 

Tugger 

25 
37 
50 

1.23 
1.35 

1.48 

Six 

Stud 

Sink 

1.23 
1.35 
1.48 

Science 

Song 

School 

1.24 
1.36 
1.48 

Concord 

Cash 

Consul 

1.23 
1.35 

1  48 

Current 

Cloud 

Cutter 

I.25I  1.27 
1.37    1.39 
I.5O1  1.52 

Thong 

Tharms 

Thorn 

1.28 
1.40 
1.54 

Tunic 

TuU 

Turban 

2 

62 
75 
00 

1.60 
1.73 
1.9S 

Stvle 

Sin 

Silver 

1.60 
1.73 
1.98 

Sort 

Scholar 

Scent 

1.60 
1.73 
1.98 

Car 

Contra 

Cool 

1.60 
1.73 
1.97 

Clock 

Custom 

Cushion 

1.62    1.65 
1.75!  1.78 
2.00    2  04 

Theban 
Thistle 
Thrash 

1.67 
1.80 
2.06 

Tumbler 

Tumid 

Turf 

2 
2 
2 

25 
?5 

2  22 
2^47 
2.72 

Silk 
Sign 
Siege 

2.22 
2.47 
2.72 

Scar 
Scale 
Saw 

2.23 

2.48 
2.72 

Concert 
Copper 
Copy 

2.22 
2.47 
2.72 

Curve 
Cube 
Cubic 

2  25'  2.29 
2  50    2  55 
2.75    2.82 

Thread 
Threat 
Thresh 

2.29 
2.55 
2.80 

Turn 

Turret 

Turtle 

3 
3 
3 

00 

25 
50 
75 
00 
25 

2  96 
3.21 
3.46 

Side 
Sick 
Shrew 

2.95 
3.20 
3.45 

Sand 

Salt 

Saint 

2.97 
3.22 
3.47 

Coral 
Cord 
Comet 

2.96 
3.21 
3.45 

Cuckoo 
Cudden 
Cue 

3.00    3  09j  Threw 
3.25    3.34   Thrift 
3.50    3.60  Thrill 

'  3  06 
3.31 
3.57 

Tusk 
Tutor 
Turnip 

3 
4 
4 

3  71 

3  95 
4.20 

Show 
Show 
Shoal 

3.70   Saddle 
3.95    Sabre 
4.20    Sack 

3.72 
3.97 
4.23 

Consort 
Corsair 
Cost 

3  70 
3.95 
4.19 

Cuff 

Culture 

Cup 

3.75    3.85 
4  00    4  13 
4.251  4.39 

Thrive 
Throb 
Throe 

3.82!  Tumor 
4  071  Tunnel 
4.33   Turbot 

4 

4 

5 

50'  4  45 
75    4  70 
00    4  95 

Ship 

Shield 

Sheet 

4.44    Saba 
4.68:  Sacred 
4.93|  Sail 

4.48    Cork 
4.73    Count 
4.98    Counter 

4.44 
4.69 
4.93 

Cupola 
Curlew 
Curtain 

4.50    4.05 
4.75    4.92 
5. 00,  5.20 

Thorne 
Thrum 

Thrust 

4. .58;  Tureen 
4.84|  Turgid 
5.09   Twang 

5 
5 
5 

25 
50 

75 

5.19 

5.44 
5.69 

Sway 

Sheath 

Swell 

5.18 
5.43 
5.67 

Spirit 

Sage 
Spline 

5.24 
5.49 
5.75 

Calk 

Corona 

Calibre 

5.18 
5.43 

5.68 

Citizen 
Custard 
Circus 

5. J 

5,E 
5.' 

5'  5.45 
0    5.71 
5    5.99 

Thumb 
Thump 
Thwart 

5.35 
5  61 
5.86 

Twig 
Twill 
Twirl 

6 
6 

7 

00 
50 
00 

5.94 

6.44 
6.94 

Sharp 

Sextant 
Settle 

5.92 
6.41 
6.90 

Saline 
Sallet 
Salve 

6.01 
6.52 
7.04 

Counsel 
Courage 
Court 

5.92 
6.41 
6.91 

C!uban 
Cuirass 
Cumber 

61 

0    6.28 

Thyme 

6.11 

Twit 

7 
8 

50    7  44 
00    7  94 

Session 
Service 
String 

7.40    Saitant 
7.89    Sandal 

7.55   Cow 
8.O9I  Crab 

7.40 
7.89 

Culvert 
Cupid 

8 

50 

8.44 

8.38 

Spoon 

9 
9 

00 
50 
00 

8  94 

9  44 
9.94 

Sebate 
Swipe 
Sedan 

8.87 
9.37 
9.86 

Sample 

Spray 

Salute 

PR 

ISMS 

lU 

10 
11 

50 
00 

10.46 
10  96 

Swival 

Secess 

Section 

Secant 

Secret 

Seed 

Secle 

Second 

Season 

10.35'  Spring 
10.84    Sallv 

A 

Code 

A 

Code 

A 

Code 

A 

Code 

12 
13 
14 
15 
16 
18 
20 

OU 
00 
00 

Z 

11.9/ 
12.99 
114.01 
15.04 
16.09 
18.18 
20.34 

11.83 
12.82 
13.80 
14.77 
15.77 
17.72 
19  69 

Sagene 

Sabian 

Sabot 

Save 

Sacrist 

Savage 

Saturn 

0.50 
0.75 
100 
1.50 
2.00 

250 

Pace 

Parish 

Paddle 

Pagan 

Pail 

Paint 

3.00 
3  50 
400 
5  00 
6.00 

7.00 

Palace 

Palette 

Panic 

Parrot 

Peace 

Pedal 

8.00 
900 
10.00 
1100 
12.00 

13.00 

Pension 

Pepper 

Period 

Person 

Petal 

Piece 

14.00 

15  00 

16  00 

17  00 

18  00 
19.00 
20.00 

Pilgrim 

Pillow 

Pine 

Plank 

Play 

Plate 

Plume 

43 


15  A  U   S  C   11 


L  O   M   B 


O  P  T  I  C  A  L 


COM  P  A  N  Y 


PUNKTAL  AND   KATRAL  FOCI  AND   CODE 

Code  for  Sphere  and  Cylinder  is  for  white  lenses,  finished  on  botli  sides.  Add  the 
name  of  color  when  colored  lenses  are  ordered.  Use  Sphero  and  Cylinder  code  words  for 
Sphero-Cylinder  combinations. 

PUNKTAL 


SPHERO 

CYLINDER 

Focus 

Code 

Code 

Focus 

Code 

Code 

Dv 

+ 

— 

Dv 

+ 

— 

0  25 

Pabular 

Pagadom 

0  25 

Palatal 

Palestra 

0.50 

Pabulum 

Paganic 

0  50 

Palate 

Palestric 

0  75 

Paca 

Paganize 

0.75 

Palatial 

Palestrical 

1  00 

Pacable 

Paganly 

1  00 

Palatic 

Palet 

1  25 

Pacane 

Page 

1  25 

Palatine 

Paletot 

1.50 

Pacate 

Pageant 

1.50 

Palato 

Palewise 

1.75 

Pacation 

Pagina 

1.75 

Palaver 

Palfry 

2  00 

Paced 

Pagine 

2.00 

Pale 

Palgrave 

2.25 

Pacha 

Pagod 

2.25 

Paleface 

Pali 

2.50 

Pachalic 

Pagodite 

2   50 

Palely 

Paliform 

2.75 

Pachi.si 

Paguma 

2.75 

Paleness 

Palling 

3.00 

Pachy 

Pah 

3.00 

Palenque 

Palinode 

3  25 

Pacific 

Pahleyi 

3  25 

Paleo 

Palisade 

3.50 

Pacify 

Paid 

3  50 

Palelola 

Palish 

3.75 

Pack 

Paien 

3  75 

Paleous 

Palkee 

4.00 

Package 

Paigle 

4  00 

Pale-sie 

Pall 

4.25 

Packer 

Pailful 

4.50 

Packling 

Pailinail 

4.75 

Packman 

Pain 

5.00 

Paco 

Painable 

5.50 

Pact 

Painful 

6.00 

Paction 

Painim 

6.50 

Pacu 

Painless 

7.00 

Pad 

Pains 

7.50 

Painted 

8.00 

Painting 

8.50 

Paintless 

9.00 

Painture 

9.50 

Painty 

10.00 

Pairer 

10.50 

Pairing 

11.00 

Pairnient 

12.00 

Paise 

13.00 

Pajock 

14.00 

Pakfong 

15.00 

Pal 

16.00 

Paldin 

18.00 

Palaina 

20.00 

Paianka 

KATRAL 


SPHERO 

CYLINDER 

Focus 

Code 

Focus 

Code 

Dv 

+ 

Dv 

+ 

7.50 

Palladic 

0.50 

Palmic 

8.00 

Pallah 

1.00 

Palmite 

8.50 

Pallet 

1.50 

Palmittin 

9  00 

Pallial 

2.00 

Palmy 

9.50 

Palliaid 

2.50 

10.00 

Palliate 

3.00 

Palp 

10.50 

PalUd 

3.50 

11.00 

Pallium 

4.00 

11.50 

Pallmall 

12  00 

Pallone 

12.50 

Pallor 

13.00 

Palm 

13.50 

Palmar 

14.00 

Palmate 

14.50 

Palmed 

15.00 

Palmette 

44 


B     A     U      S      C      II 


L     O      M      li 


O     1'    T    I    (■    A     L 


<)     M     1'    A     N     Y 


THICKNESS   OF  UNCUT   LENSES 

Centex  Lenses  tire  snp])lie(l  in  Standard  and  Uimloss  tliickncss,  witli  an  allowanre  of  .2  nnii 
each  way.     The  nieasurenicnts  are  <j;iveii  in  niillimeters  and  are  for  tlie  center  of  the  lens. 

Priniex  and  Pnnktal  lenses  are  coni])nted  for  one  thickness  only. 

Centex  lenses  can  be  supi)lieil  of  a  thickness  varyin<f  from  this  schedule,  on  special  order  and 
at  a  special  price. 

Thickness  of  INIeniscus  lenses  is  given  for  6.00  curve. 

To  determine  the  thickness  in  the  center  of  Sphero-Cylinder  lenses, 
+  O  +,  add  the  foci  of  sphere  and  cylinder  together  and  use  convex  cylinder  tahle. 

—  O  — ,  take  sphero  focus,  using  concave  sphero  table. 
+  ^  — ,  take  sphero  focus,  using  convex  cylinder  table. 

—  O  + ,  if  sphero  focus  is  greater,  sul)tract  cylinder  from  sphero  and  use  the  concave  sphero  table. 

—  O  + ,  if  cylinder  focus  is  greater,  subtract  sphero  from  cylintler  and  use  the  convex  cylinder 
table. 


CENTEX 

PUNKTAL 

D 

Dble. 
and  Peris. 

+ 

Oval  and 

42  mm. 

Dble. 

and  Peris 

+ 

47  mm. 

Meniscus 
+ 

and 
Toric 

Cyl.  + 
Sph.  Cyl. 

+  C  + 
42  and  47 

Dble. 
and  Peris. 

Oval 

Dble. 
and  Peris. 

+ 
42  and  47 

Meniscus 

and 
Toric  — 
Sph.-Cyl. 

Cylinder 

Dv 

+ 

mm. 

mm. 

^' 

Stan 

1,3 

Rim 

1.7 

Stan 

Rim 

Stan 

Rim 

Stan 
1.3 

Rim 

1.7 

Stan 

Rim 

Stan 

Rim 

16 

Stan 
1.4 

Rim 

Stan 

Rim 

1  6 

0  1? 

1.3 

1.7 

1.3 

1.7 

1,4 

1.6 

1.4 

1.6  :  1.3 

0  25 

1.3 

1.7 

1.3 

1.7 

1.3 

1.7 

1.3 

1.7 

1.4 

1.6 

1.4 

1.6 

1.4 

1.6 

1.3 

1.6 

0.25 

1.4 

1.5 

0  37 

1.3 

1.7 

1.3 

1.7 

1.3 

1.7 

1.3 

1.7 

1.4 

1.6 

1.4 

1.6 

1.4 

1.6 

1.3 

1.6 

n  50 

1.4 

1.8 

1.4 

1.8 

1.4 

1.8 

1.4 

1.8 

1.4 

1.6 

1.4 

1.6 

1.4 

1.6 

1.3 

1.6 

0  50 

1.5 

1.5 

0  62 

1.4 

1.8 

1.4 

1.8 

1.4 

1.8 

1.4 

1.8 

1.4 

1.6 

1.4 

1,6 

1.4 

1.6 

1.3 

1.6 

0.75 

1.4 

1.8 

1.4 

1.8 

1.4 

1.8 

1.4 

1.8 

1.3 

1.5 

1.3 

1.5 

1.3 

1.5 

1.3 

1.6 

0  75 

1.7 

1.5 

0  87 

1.5 

1.9 

1.5 

1.9 

1.5 

1.9 

1.5 

1.9 

1.3 

1,5 

1.3 

1,5 

1.3 

1.5 

1.3 

1.6 

1  00 

15 

1.9 

1.5 

1.9 

1.5 

1.9 

1.5 

1.9 

1.3 

1,5 

1.3 

1,5 

1.3 

1.5 

1.3 

1.6 

100 

1.8 

1.5 

1  12 

1.5 

1.9 

1.5 

1.9 

1.5 

1.9 

1.5 

1.9 

1.2 

1.4 

1.2 

1.4 

1.2 

1.4 

1.3 

1.6 

1  25 

1.6 

2.0 

1.6 

2.0 

1.6 

2.0 

1.6 

2.0 

1.2 

1.4 

1.2 

14 

1.2 

1.4 

1.3 

1.6 

1  25 

1.8 

1.4 

1  37 

1  6 

2  0 

1.6 

2.0 

1.6 

2.0 

1.6 

2.0 

1.1 

1.3 

1.1 

13 

1.1 

1.3 

1.3 

1.6 

1  50 

1.6 

2.0 

1.6 

2.0 

1.6 

2.0 

1.6 

2.0 

1.1 

1.3 

1.1 

1.3 

1.1 

1.3 

1.3 

1.6 

150 

2.0 

1.3 

1  fii? 

1  7 

2  1 

17 

2.1 

1  7 

2.1 

1.7 

2.1 

1.0 

1.2 

1.0 

1.2 

1,0 

1.2 

1.3 

1.6 

1  75 

1.7 

2.1 

1.7 

2.1 

1.7 

2.1 

1.7 

2.1 

1.0 

1.2 

1.0 

1.2 

1.0 

1.2 

1.3 

1.6 

1  75 

2.1 

1.2 

200 

1.8 

2.2 

1.8 

2.2 

1.8 

2.2 

1.8 

2.2 

1.0 

1.2 

1.0 

1.2 

1.0 

1.2 

1.3 

1.6 

2  00 

2.2 

1.1 

2  25 

1.9 

2.3 

1.9 

2.3 

1.9 

2.3 

1.9 

2.3 

0.9 

1.1 

0.9 

1.1 

0.9 

1.1 

1.3 

1.6 

2.25 

2.3 

1.1 

2  50 

1  9 

2  3 

19 

2.3 

1  9 

2.3 

1.9 

2.3 

0.8 

1.0 

0.8 

1.0 

0.8 

1.0     1.2 

1.5 

2  50 

2.4 

1.0 

2  75,  2.0 

2.4 

2.0 

2.4 

2.0 

2.4 

2.0 

2,4 

0.8 

1.0 

0.8 

1.0 

0.8 

1.0     1.2 

1.5 

2.75 

2.5 

1.0 

3  00    2  1 

2.5 

2.1 

2.5 

2.1 

2.5 

2.1 

2,5 

0.7 

0.9  I  0.7 

0.9 

0.7 

0.9     1.2 

1.5 

300 

2.6 

0.9 

3  25    2  2 

2  6 

2  2 

2  6 

2.2 

2  6 

2  2 

2  6 

0,6 

0,8 

0,6 

0,8 

0.6 

0.8  i  1.2 

1.5 

3  25 

2.7 

0.9 

3  50    2  3 

2.7 

2.3 

2.7 

2.3 

2.7 

2,3 

2.7 

0,6 

0,8 

0,6 

0.8 

0.6 

0.8 

1.2 

1.5 

3  50 

2.8 

0.8 

3  751  2.4 

2,8 

2  4 

2.8 

2.4 

2  8 

2.4 

2.8 

0.6 

0,8 

0,6 

0.8 

0.6 

0.8 

1.2 

1.5 

3  75 

3.0 

0.8 

4  00    2  5 

2  9 

2.5 

2.9 

2.5 

2.9 

2.5 

2.9 

0.6 

0,8 

0,6 

0.8 

0.6 

0.8 

1.2 

1.5 

400 

3.1 

O.V 

4.25    2.6 

3.0 

2.6 

3.0 

2.6 

3.0 

2.6 

3.0 

0.6 

0,8 

0.6 

0.8 

0.6 

0.8 

1.2 

1.5 

4.25 

3.2 

0.7 

4  50    2.6 

3  0 

2  6 

3  0 

2.8 

3.1 

2  6 

3.0 

0,6 

0.8 

0.6 

0.8 

0.6 

0.8 

1.2 

1.5 

450 

3.3 

0.6 

4  75   2.7 

3  1 

2  7 

3  1 

2.9 

3  2 

2  7 

3  1 

0  6 

0.8 

0.6 

0.8 

0.6 

0.8 

1.2 

1.5 

475 

3.4 

0.6 

5  00   2  8 

3.2 

2.9 

3.3 

3.0 

3.3 

2.9 

3.3 

0,5 

0.7 

0.5 

0.7 

0.5 

0.7 

1.2 

1.5 

500 

3.6 

0.6 

5  25    2  9 

3  3 

3  0 

3  4 

3  1 

3  4 

3  0 

3  4 

0  5 

0,7 

0.5 

0.7 

0.5 

0.7 

1.2 

1.5 

5  50 

3.7 

0.5 

5  50    3  0 

3  4 

3  1 

3  5 

3.2 

3  5 

3  1 

3.5 

0,5 

0,7 

0.5 

0.7 

0.5 

0.7 

1.2 

1.5 

600 

4.0 

0.5 

5.75    3.1 

3.5 

3.2 

3.6 

3.3 

3.6 

3.2 

3.6 

0.5 

0,7 

0.5 

0.7 

0.5 

0.7 

1.2 

1.5 

6  50 

4.2 

0.5 

6  00    3  2 

3  6 

3,4 

3.7 

3.6 

3.8 

3.4 

3.7 

0.5 

0.7 

0.5 

0.7 

0.5 

0.7 

1.2 

1.5 

700 

4.4 

0.5 

6  50   3  4 

3  8 

3  6 

3.9 

3  9 

3  6 

3  9 

0.5 

0.7 

0.5 

0.7 

0.5 

0.7 

1.2 

1.5 

7  50 

4.6 

0.5 

7.00    3.6 

4.0 

3.9 

4.1 

4.2 

3.9 

4.1 

0.5 

0.7 

0.5 

0.7 

0.5 

0.7 

1.2 

1.5 

8  00 

) 

7.50   3.8 

4  2 

4  1 

4,3 

4.5 

4.1 

4.3 

0.5 

0.7 

0.5 

0.7 

0.5 

0.7 

1.2 

1.5 

to 

[ 

0.5 

8  Oft   4  1 

4.6 

4.4 

4.6 

4.8 

4.4 

4.6 

0.5 

0.7 

0.5 

0.7 

0.5 

0.7 

1.2 

1  5 

20  00 

) 

42  mm  ROUND 

Edge 

PRISMS 

D 

Dble  4 

Peris  4- 

D 

Dble  +  F 

•eris  4 

D       Dble  H 

h  Peris +  j 

Thick 

ness 

Stan 

Rim 

8  50 

4.2 

4.2 

11.00 

5.1 

5.1 

16 

.00         6.9 

7 

.0 

0.50  to    1 

00 

1.2 

1.6 

9.00 

4.3 

4.3 

12  00 

5.4 

5.4 

If 

00 

7.8 

t 

.1 

150  to    2 

10 

1.0 

14 

9  50 

4.5 

4,5 

13  00 

5.7 

5.7 

21 

.00 

8.8 

t 

.4 

2  50  to    3 

10' 

0.8 

1.2 

10  00 

4.7 

4.7 

14  00 

6.1 

6.1 

3  50  to    5 

JO 

0.6 

1.0 

10  50 

4.9 

4.9 

15.00  1      6.5    1 

6.5 

6  00  to  20 

00 

0.4 

45 


15     A      U      S      C      II 


LOME 


OPTICAL 


COMPANY 


TABLE   OF  MINIMUM   QUANTITIES 

The  tables  on  this  and  the  opposite  page  show  quantities  in  pairs,  constituting  original  pack- 
ages for  the  various  kinds  of  Centex  lenses  as  they  are  put  up  for  stock. 

In  order  to  obtain  dozen  prices,  the  quantities  specified,  or  more  of  a  kind  and  focus  should 
be  ordered  and  not  less  than  six  pairs  in  a  division  of  focus  numliers. 

For  broken  packages,  an  extra  charge  of  40  cents  per  dozen  pairs  is  made  to  cover  additional 
cost  of  selecting  and  packing. 

All  lenses  listeil  Ijy  the  pair  are  not  subject  to  extra  charge. 
Prescription  Prices  will  be  charged: 

a:    For  all  lenses  not  quoted  by  the  dozen. 

b:    For  special  foci. 

c:    For  less  than  six  pairs — in  a  division  of  focus  numbers  or  in  Piano. 

d :    For  lenses  not  regularly  carried  in  stock,  when  ordered  in  small  quantities. 


}  One  Stanilard  Size,  Shade  or  Thickness  . 


One  Standard  Size  or  Shade 


One  Thickness,  Size  or  Shade 


Flat  Blanks 
Moulded  Blanks 
Piano  Flat 
Piano  1 . 25  curve 
Piano  6.00  curve 
Piano  9.00  ciu've   ) 
Piano  Rough  Flat 
Piano  Rough  1 .  25  curve 
Piano  Rough  6.00  curve 
Piano  Rough  9.00  curve 

Piano  +  or  —  42  mm  and  47  nun  round 

Double  +  or  —  oval 

Double  +  or  —  42  mm  round 

Double  +  or  —  47  mm  round      

Periscopic  +  or  —  Oval 

Periscopic  +  or  —  42  mm  round 

Periscopic  +  or  —  47  mm  round 

Meniscus  6.00  curve  +  or  —  47  mm  round 

Meniscus  9.00  curve  +  or  —  47  mm  round 

Sphero,  Colored,  One  Shade 

Flat 

Cyliiifler  Rough  +  or  —  42  mm  sc|uare  or  47  mm  round  (one 
thickness)  2  to  4  nun  thick 

Cylinder  Rough  +  or  —  42  mm  scjuare  or  47  nun  round  (one 
thickness)  5  to  10  nmi  thick 

Cylinder  Piano  +  or-  42  mm  .square 

Cylinder  Piano  +  or  —  47  mm  round 

Sphero-Cylinder  +  O  +  or  -  O  -  42  mm  scjuare     .... 

Sijhero-Cylinder  +  O  +  or  -  O  -  47  mm  round 

Sphero-Cylinder  +  O  -  or  -  O  +  42  nun  scjuare     .... 

Sphero-Cylinder  +  o  -  or  -  O  +  47  nun  round 

Cylinder,  Colored,  One  Shade 

Toric 

Cylinder  Rough  6.00  and  9.00  curve  (one  thickness)  2  to  4 
mm  thick 

Cylinder  Rough  6.00  and  9.00  curve  (one  thickness)  5  to  10 
mm  thick 

Cylinder  Piano  +  or  — 

Sphero-Cylinder  +  O  -|-  and  — O— ^^^ 

Sphero-Cylinder  -|-  O  —  and  —  0-|- !^! 

Cylinder,  Colored,  One  Shade .    . 


UNCUT 


6 

12 

6 

6 

12 

6 

6 

12 

6 

3 


12 

6 

12 

6 

12 
6 
6 
6 
3 


2.25 
to 
4.25 


6 

12 

6 

6 

12 

6 

6 

12 

6 

3 


4.50 
to 
6.00 


3 
12 
6 
3 
12 
6 
6 
6 
3 
3 


6.50 
to 

8.00 


3 
12 
6 
3 
12 
6 
6 
6 
3 
3 


46 


c   A   u    sen         &        L    o    M    n     /^^x     o   i-  t  i   r  a   l        c  o  m    i'  a   n  y 


TABLE   OF  MINIMUM   QUANTITIES 

(CONTINUED) 


1.I- U      '-11    [  One  Standard,  Size  or  Shade     .    .    . 
Mi-CoquiUe  \ 

Plano-Piisnis  0.50  to  3.50    A 

Plano-Prisius  4.00  to '20.00A 

Rough  Prisms  (one  thickness)  0 .  50  to  3 .  50  A     .    . 

Sjihero -Prisms  0 .  1^2  to  4 .  "25+  S,  0 .  50  to  3 .  50  A    . 

Cylinder  Prisms  O.l'-i  to  4. "25  +  C,  0.50  to  3, 50  A 

Wafers,  Cement  (l."25  c  or  Piano) 

Wafers,  Cement  (— 0  +  or  +  o+) 

Wafers,  Opifex 


UNCUT 


12 

12 

C 


12 
12 


0.12  2.25 
to  to 
2.00      4.25 


12 
6 
6 


12 
6 
6 


4.50 
to 
6.00 


6.50 
to 
8.00 


EDGED 


0.12 
to 
2.00 

2.25 
to 
4.25 

12 

12 

12 

12 

12 

12 

12 

12 

12 

12 

6 

6 

12 

12 

12 

12 

12 

12 

12 

12 

12 

6 

6 

6 

12 

6 

12 

6 

6 

6 

12 

12 

6 

6 

6 

6 

4.50 
to 
6.00 


6.50 
to 
8.00 


Bifocals,  Split 

Bifocals,  Cement 

Bifocals,  Perfection   .... 

Bifocals,  Perfection  Uppers. 

Bifocals,  Perfection  Lowers 

Bifocals,  Opifex 

Piano  Flat 

Piano  1 .  25  curve    [  One  Standard  Size  or  Shade 

Piano  GOO  curve 

Double,  +  or  — 

Periscopic,  +  or  — 

Meniscus,  +  or  —      

Piano-Cylinder,  +  or  — 

Spliero-Cylinder  +  O  +  and  —  O  —     ... 
Si^hero-Cylinder  +  O  —  and  —  O  +     ... 

Toric  Piano-Cylinder,  -F  or  — 

Toric  Sphero-Cylinder,  +  O  +  and  —  O  — 

Toric  Sphero-Cylinder,  +  O  —  and  —  O  -f 

Coquille, 

Mi-CoquiUe 

Piano-Prisms,  0 .  50  to  3 .  50  A      .    . 

Plano-Pri.sms,  4.00  to  20.00  A    .    . 

Cylinder  Prisms 

Wafers,  Cement  (1.25  c  or  Piano) 
Wafers,  Cement  (—  O  4-)  .  .  .  . 
Wafers,  Opifex 


One  Standard,  Size  or  Shade 


12 

12 

6 

6 


12 

12 

6 


12 
12 


12 

12 

6 


47 


C     A     U      S     C     II  &  L     O     M      B      /^^^\       OPTICAL  COMPANY 


PRESCRIPTION  BLANK 


B 


No. 


BAUSCH  &  LOMB  OPHTHALMIC  LENSES 

From 


Date. 


Check  Form  of  Test  Lens  Used 
Double Plano Meniscus-- 


II. 


Sphere  Test  Lens: 

1)  power  P.  D.    mm 

2)  reading  add.    P.  D. mm 

Cylinder  Test  Lens: 

3)  power 

4)  axis 

Check  position  of  Cf/l.  in  front  or  txtck  of 
Sph.  lens  for  all' foci  of  6.00  D  and  over 

HI,  Prism: 

5)  power 

(!)  location  of  base 
IV.  Location  of  Test  Lens : 

7)  distance  from  inner  surface  of  lens 
to  cornea 

8)  distance  between  inner  lens  sur- 
faces of  Sph.  and  Cyl.  lenses 


RIGHT 


D« 


Front 
Back 


LEFT 


D„ 


Front 
Back 


mm 
mm 


19       ^, 


Adopted  at  iS^ajtles  Convention  as  Tii/ernationnl  S/diidard. 


Katral 


Center 
Holes 


LENS  SPECIFICATIONS 
Centex Primex Punktal 

Eye  Size  Bevel  Edge 

Lens  Shape Rimless  Edge 

FRAME  MEASUREMENTS 

Bridge,  vertical  adjustment  up  ._ mm,  down 

Bridge,  horizontal  adjustment    in      mm,  out 

Frame  Inclination up    mm,  down 

Temple  length   mm,  height    mm 


mm 
mm 
mm 


REMARKS 


TO 


48 


H     A     IT      S     C      II  &  L     O     M      n       /@S^        OPTICAL  COMPANY 


PRESCRIPTION   BLANK   DIRECTIONS 

BELIEVING  it  would  he  (lcsiral)lc  for  all  coiiccnuMl  to  ostahlisii  a  standard 
[)rescription  blank  for  eye  refraction,  we  offer  and  reconiinend  the  use 
of  the  form  shown  on  the  opposite  paoe.  This  hlaiik  enahles  its  user 
to  record  plainly  and  systematically  the  result  of  the  e\;nnination,  to  he  fol- 
lowed in  grindino-  the  lenses  of  whatever  form  prescrihed  in  order  to  ohtain 
the  same  correction  as  that  of  the  original  test  lenses. 

It  is  important  to  know  the  form  of  lens  used  in  the  test,  and  this  should  he 
indicated  by  a  check  mark  in  the  space  provided  in  prescription  hlank.  Test 
lenses  generally  are  hased  on  the  dioptric  (D)  method  of  refraction.  They 
can  be  reduced,  however,  to  the  vertex  system  by  the  use  of  our  Vertex  Diop- 
trometer.  It  is  also  necessary  to  note  the  position  of  the  cylinder — whether 
in  front  of,  or  behind,  the  sphero  for  all  foci  of  (1. 00  I),  and  over. 

The  distance  between  the  apex  of  the  cornea  and  the  inner  surface  of  the 
lens  (7)  should  be  noted,  and  when  test  combinations  are  used  the  distance 
between  the  inner  surfaces  of  the  lenses  (8)  should  also  be  recorded.  For 
strong  lenses,  this  data  is  essential  if  the  proper  correction  is  to  be  obtained : 
this  is  particularly  true  in  cataract  cases,  for  which  we  recommend  Katral 
lenses. 

The  oculist,  optometrist  or  optician  can  secure  all  the  required  data  by 
means  of  the  following  instruments,  which  are  illustrated  in  our  catalog  of 
Ophthalmic  Apparatus  antl  in  special  descriptive  circulars : 

1 .  Vertex  Dioptrometer,  the  use  of  which  will  enable  the  operator  to  de- 
termine the  distance  from  the  inner  surface  of  any  ophthalmic  lens  to  the 
focal  point  and  thus  ascertain  the  Dy,  or  vertex  refraction,  of  the  lens 

2.  Interpupillary  Distance  Gauge,  for  quickly  and  accurately  deter- 
mining the  pupillary  distance  for  distance  and  reading. 

3.  Keratometer,  for  measuring  the  distance  between  the  apex  of  the 
cornea  and  the  inner  surface  of  the  lens,  as  required  in  the  hlank. 
It  may  also  he  used  for  measuring  the  diameter  of  the  pupil. 


C     A     U      S     C      II  &  L     O     M      15       /C^S^\        O     P    T    I 


C    A    L  COMPANY 


SIZES   OF  UNCUT  LENSES 

Tliese  are  regular  sizes.  In  addition,  we  supply  Piano-Rough,  Meniscus  Piano  and  Meniscus 
Rough  lenses  ni  51,  57,  63,  71  and  80  mm  diameters,  round. 


50 


B     A     If      S     C      II  &  L     O     M      R       /^&\       O    P    T    I    C    .\    li  ('    O    M     P    A    X    Y 


PRICES  FOR  UNCUT  LENSES 
PLANO-ROUGH,  FLAT  AND  MENISCUS 

(ONE   SIDE   GROUND   AND   POLISHED) 

CENTEX 


Per  Dozen  Pairs 

ROUND 

47  mm 

51  mm 

57  mm 

63  mm 

71  mm 

80  mm 

White 

Flat 

2  to    2.5  1 

3  to    4       I  ,y„^  t,,i^.,, 
5  to    7 

$1.00 

1.90 
2.25 

8  to  10      J 

3^00 

1.25   Curve 

2  to    2.5  1 

1.85 

^  to    4         n^jjj  jjj;^.!, 
5  to    7 

2.15 
2.50 

8  to  10      J 

3.25 

-  6.00  Curve 

2  to    2.5  1 

?  to    4         ,^^3  tj^i^.1, 

0  to    7 

3.50 

$5.00 

$6.50 

$8.00 

$10.50 

$13.00 

4.00 
4.50 

5.50 
6.00 

7.00 
7.50 

8.50 
9.00 

11.00 
11.50 

14.00 
15.00 

8  to  10      J 

5.50 

7.00 

8.50 

10.00 

12.50 

16.00 

+  6.00  Curve 

2  to    2.51 

4.25 

5.75 

8.00 

10.00 

13.00 

16.00 

^  to    4         „,,„  ti.ipi, 
0  to    7 

4.75 
5.25 

6.25 
6.75 

8.50 
9.00 

10.50 
11.00 

13.50 
14.00 

17.00 
18.00 

8  to  10      J 

6.25 

7.75 

10.00 

12.00 

15.00 

19.00 

-  9.00  Curve 

2  to    2.5 

7.00 

3  to    4       ,  „^,^  tiji^.j, 
5  to    7 

8.00 
9.00 

8  to  10 

11.00 

+  9.00  Curve 

2  to     2.5 

8.50 

3  to    4         j^jjj  tiji^,!, 
5  to    7 

9.50 
10.50 

8  to  10      1 

12.50 

51 


UAUSCH  &  LOMrS       /^^^%\       OPTICAL  COMPANY 


PRICES  FOR   UNCUT  LENSES 
PLANO-ROUGH,  FLAT  AND  MENISCUS 

(ONE  SIDE  GROUND  AND  POLISHED) 

CENTEX 


ROUND 

Per  Dozen  Pairs 

47  mm 

51  mm 

57  mm 

63  mm 

71  mm 

80  mm 

Smoke  and  Blue 

Flat 

2  to    2.5] 

8  to  10 

$2.25 
2.75 
3.25 
4.25 

1.25  Curve 

2  to    2.5] 

3  to    4                 .1  •  1 
5  to    7         m™  thick 

8  to  10 

2.50 
3.00 
3.50 
4.50 

6.00  Curve 

2  to    2 . 5 

f[°    !         mm  thick 
5  to    7 

8  to  10      J 

5.00 
5.75 
6.50 
7.75 

$7.00 
7.75 
8.50 
9.25 

$  9.00 
10.00 
11.00 
12.00 

$11.00 
12.00 
13.00 
14.00 

$14.50 
15.50 
16.50 
17.50 

$18.00 
19.50 
21.00 
22.50 

+  6.00  Curve 

2  to    2.5] 

3  to    4                 ,.  •  , 
5  to    7        '""^  thick 

8  to  10      J 

6.00 
6.75 
7.50 
8.25 

8.00 

8.75 

9.50 

10.25 

11.00 
12.00 
13.00 
14.00 

13.50 
14.50 
15.50 
16.50 

18.00 
19.00 
20 .  00 
21.00 

22.00 
23.50 
25 .  00 
26.50 

Amber 

Flat 

2  to    2.5] 

3  to    4                 ,,  •  , 
-  .       „       ^  mm  thick 
5  to    7 

8  to  10 

3.00 
3.50 
4.00 
4.50 

1.25  Curve 

2  to    2.5] 

3  to    4                 ,,  .  , 
5  to    7         mm  thick 

8  to  10 

3.25 
3.75 
4.25 
4.75 

—  6.00  Curve 

2  to    2.5] 

3  to    4                 M  •  , 
t,  .       „      1  mm  thick 
5  to    7 

8  to  10 

6.50 

7.25 
8.00 
8.75 

8.75 

9.75 

10.75 

11.75 

11.50 
12.75 
14.00 
15.25 

14.00 
15.50 
17.00 
18.50 

18.50 
20.25 
22.00 
23.75 

22.75 
25.00 

27.25 
29.50 

+  6.00  Curve 

2  to    2.5] 

3  to    4                 „  .  , 
5  to    7         mm  thick 

8  to  10 

7.50 
8.25 
9.00 
9.75 

10.00 
11.00 
12.00 
13.00 

14.00 
15.25 
16.50 
17.75 

17.50 
19.00 
20.50 
22.00 

22.75 

24.75 
26.75 
28.75 

28.00 
30.25 
32.50 
34.75 

52 


PRICES  FOR  UNCUT   LENSES 
PLANO-ROUGH,  FLAT  AND   MENISCUS 

(ONE  SIDE  GROUND   AND   POLISHED) 

CENTEX 


ROUND 

Per  Dozen  Pairs 

47  mm 

51  mm 

57  mm 

63  mm 

71  mm 

80  mm 

Amethyst 

Flat 

2  to    2.5] 

3  to    4      [  n^Qi  thick 

$3.25 

3.50 

5  to    7 

4.00 

8  to  10      I 

4.50 

1.25  Curve 

2  to    2.5] 

3.75 

•"^  to    4         ^^  ti^j.]. 

4.00 

5  to    7 

4.50 

8  to  10      J 

5.00 

—  6.00  Curve 

2  to    2.5] 

3  to    4       I  mm  thick 
5  to    7 

7.00 

$10.00 

$13.00 

$16.00 

$21.00 

$26.00 

7.75 

11.00 

14.25 

17.50 

22.75 

28.25 

8.50 

12.00 

15.50 

19.00 

24.50 

30.50 

8  to  10 

9.25 

13.00 

16.75 

20.50 

26.25 

32.75 

+  6.00  Curve 

2  to    2.5] 
5  to    7 

8.50 

11.50 

16.00 

20.00 

26.00 

32.00 

9.25 
10.00 

12.50 
13.50 

17.25 
18.50 

21.50 
23.00 

27.75 
29.50 

34.25 
30.50 

8  to  10      J 

10.75 

14.50 

19.75 

24.50 

31.25 

38.75 

Fieuzal 

Flat 

2  to    2.5] 

3.25 

3  to    4                 ti^ici- 

3.50 

5  to    7 

4.00 

8  to  10      J 

4.50 

1.25  Curve 

2  to    2.5] 

3.75 

^  to    4         ,^j^  ti^ick 

4.00 

5  to    7 

4.50 

8  to  10      J 

5.00 

-  6.00  Curve 

2  to     2.51 

7.00 

10.00 

13.00 

16.00 

21.00 

26.00 

3  to    4                 ti^ici^ 
5  to    7 

7.75 
8.50 

11.00 
12.00 

14.25 
15.50 

17.50 
19.00 

22.75 
24.50 

28.25 
30.50 

8  to  10 

9.25 

13.00 

16.75 

20.50 

26.25 

32.75 

4  6.00  Curve 

2  to     2.5] 

8.50 

11.50 

16.00 

20.00 

26.00 

32.00 

3  to    4                 ti^ick 
5  to    7 

9.25 

12.50 

17.25 

21.50 

27.75 

34.25 

10.00 

13.50 

18.50 

23.00 

29.50 

36.50 

8  to  10 

10.75 

14.50 

19.75 

24.50 

31.25 

38.75 

53 


R     A     V      H     C     U  &  L     O     M      n       /S^i^        OPTICAL  (^    O    M     P    A    N    Y 


PRICES   FOR  UNCUT  LENSES 
PLANO 

(GROUND   AND  POLISHED   ON  BOTH  SIZES) 

CENTEX 


Object  Target 


Image  as  Seen  Through  Lens 


Piano  len.se.s  are  made  flat  and  in  the  following  curves: 

(a)  Flat  :  Oval  antl  round ;  wliite  anrl  colored. 

(b)  1.25  D.  Curve:     Oval  and  round;  white  and  colored. 

(c)  6.00  D.  Curve:     Round;  white  and  colored. 

(d)  9.00  D.  Curve:     Round;  white  and  colored. 

White  lenses  are  supplied  regularly  of  our  crown  glass. 

Colored  lenses  are  supplied  only  in  our  standard  shades  with  some  variation  of  shade  either 
way. 

Colored  lenses  may  be  .selected  to  approximate  closely  the  shade  of  a  sample  within  the  limits 
of  our  regular  shades,  however,  and  at  an  extra  price  of  $1.50  per  tlozen  pairs. 


OVAL 

Per  Dozen  Pairs 

44x34 
mm 

45  X  35.5 
mm 

50x40 
mm 

60x50 
mm 

70x60 

Stan. 

Rim. 

Stan. 

Rim. 

mm 

White 

Piano  Flat 

Piano  1.25  Curve 

Smoke  and  Blue 

Piano  Flat 

$1.10 
1.50 

$1.20 
1.60 

$1.50 

2.00 

2.00 
2.75 

2.25 
3.00 

$1.60 

2.10 

2.10 

2.85 

2.35 
3.10 

$1.75 
2.50 
3.00 
3.50 

$3.00 
4.25 
5.25 
6.00 

$4.00 
5  50 

Piano  1 .  25  Curve 

Amber 

Piano  Flat 

Piano  1.25  Curve 

Amethyst  and  Fieuzal 

Piano  Flat 

7.00 
8.00 

Piano  1.25  Curve 

54 


n     A     r      S     C      11  &  L     O     M     B       /<MS£a^\        O     P    T    I     (•    A    L  C    O    M     I>    A     N    V 


PRICES  FOR  UNCUT  LENSES 
PLANO 

(CONTINUED) 

CENTEX 


ROUND 

Per  Dozen  Pairs 

42  mm 

47  mm 

51 
mm 

57 
mm 

63 
mm 

71      ' 
mm 

80 

Stan. 

Rim. 

Stan. 

Rim. 

mm 

White 

Piano  Flat 

$1.25 

$1.40 

$1.60 

$1.85 

$2.50 

$3.00 

$4.00 

$5.25 

$7.00 

Piano  1 .  25  Curve    .... 

1.50 

1.65 

1.85 

2.10 

2.50 

3.00 

4.00 

5 .  25 

7.00 

Piano  COO  Curve    .... 

3.50 

4.00 

5.00 

6.50 

8.00 

10.50 

13.00 

Piano  9 .  00  Curve    .... 

7.00 

Smoke 

Piano  Flat 

1.75 

1.90 

2.25 

2.50 

3.50 

4.25 

5.50 

7.25 

10.00 

Piano  1 .  25  Curve    .... 

2.00 

2.15 

2.50 

2.75 

3.50 

4.25 

5.50 

7.25 

10.00 

Piano  6.00  Curve    .... 

5.00 

5.50 

7.00 

9.00 

11.25 

14.75 

18.00 

Piano  9 .  00  Curve    .... 

10.00 

Blue 

Piano  Flat 

1.75 

1.90 

2.25 

2.50 

3.50 

4.25 

5.50 

7.25 

10.00 

Piano  1 .  25  Curve    .... 

2.00 

2.15 

2.50 

2.75 

3.50 

4.25 

5.50 

7.25 

10.00 

Piano  6.00  Curve    .... 

5.00 

5.50 

7.00 

9.00 

11.25 

14.75 

18.00 

Piano  9.00  Curve    .... 

10.00 

Amber 

Piano  Flat 

2.25 

2.40 

3.00 

3.25 

4.50 

5.25 

7.00 

9.25 

12.25 

Piano  1.25  Curve    .... 

2.50 

2.65 

3.25 

3.50 

4.50 

5.25 

7.00 

9.25 

12.25 

Piano  6 .  00  Curve    .... 

6.25 

6.75 

8.75 

11.25 

14.00 

18.25 

22.50 

Piano  9 .  00  Curve    .... 

12.25 

Amethyst 

Piano  Flat 

2.50 

2.65 

3.25 

3.50 

5.00 

6.00 

8  00 

10..>() 

14.00 

Piano  1 .  25  Curve    .... 

3.00 

3.15 

3.75 

4.00 

5.00 

6.00 

8.00 

10.50 

14. 00 

Piano  6.00  Curve    .... 

7.00 

7.50 

10.00 

13.00 

16.00 

21.00 

26.00 

Piano  9.00  Curve    .... 

14.00 

Fieuzal 

Piano  Flat     

2.50 

2.65 

3.25 

3.50 

5.00 

6.00 

8.00 

10.50 

14.00 

Piano  1 .  25  Curve    .... 

3.00 

3.15 

3.75 

4.00 

5.00 

6.00 

1    8.00 

10.50 

14. 00 

Piano  (i.OO  Curve    .... 

7.00 

7.50 

10.00 

13.00 

16.00 

21.0(1 

^26.(10 

Piano  9.00  Curve    .... 

14.00 

i 

1 

: 

EXTRAS 

Gauged  lense.s,  ordered  in  mm  thickne-ss,  wliifh  can  be  selected  from  .stock: 


Oval 
42  mm  Round 
47  mm  Round 
Gauged  lenses,  orderci 
price  of  regular  lenses. 


50  cents  per  dozen  pairs  extra. 
50  cents  ()er  dozen  pairs  extra. 
75  cents  per  dozen  pairs  extra, 
in  nun  tliickncss,  wliicli  camiot  he  .selected  from  stock,  Ihrce  times  the 


55 


B     A     U      S     C      H  &  L     O     M      C      /^^2%\       OPTICAL  COMPANY 


PRICES  FOR  UNCUT  LENSES 

PLANO   AND  DOUBLE 
CENTEX 


Object  Target 


Image  as  Seen  Through  Lens 


White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


Per  Dozen  Fairs 


OVAL 


44  X  34  mm 


Stan. 


Rim. 


ROUND 


42  mm 


Stan. 


Rim. 


ROUND 


47  mm 


Stan. 


Rim. 


Piano 


0 

12  to  2 

00 

2 

25  to  4 

25 

4 

50  to  G 

00 

6 

50  to  8 

00 

8 

50  to  10 

00 

10 

50  to  13 

00 

14 

00  to  16 

00 

18 

00  to  20 

00  J 

+  or 


Double 


0 

12  to 

2 

00 

2 

25  to 

4 

25 

4 

50  to 

G 

00 

G 

50  to 

8 

00 

8 

50  to  10 

00 

10 

50  to  13 

00 

14 

00  to  IG 

00 

18 

00  to 

20 

00  J 

+  or 


$1.15 
1.40 
1.65 
1.90 


$1.25 
1.50 
1.75 
2.00 


$1.50 
1.75 
2.00 
2.50 
3.00 
4.50 
6.00 
7.50 


1.25 
1.50 
1.75 
2.00 
2.50 
3.50 
4.50 
6.00 


$1.65 
1.90 
2.15 
2.65 


$2.00 
2.50 
3.00 
3.75 


B2.25 
2.75 
3.25 
4.00 


1.40 
1.65 
1.90 
2.15 


2.00 
2.50 
3.00 
3.75 


2.25 
2.75 
3.25 
4.00 


EXTRAS 

Lenses  centered  (center  indicated)  15  cents  per  dozen  pairs  extra. 
Gauged  lenses  ordered  in  mm  thicliness,  which  can  be  selected  from  stock, 

44  X  34  Oval,  50  cents  per  dozen  pairs  extra. 

42  mm  Round,  50  cents  per  dozen  pairs  extra. 

47  mm  Round,  75  cents  per  dozen  pairs  extra. 
Gauged  lenses,  ordered  in   mm  thickness,  which  cannot  be  selected  from  stock,  three  times  the  price 
of  regular  lenses. 


56 


V.     A     U      S     C      II  &  L     O     M      I!       /@^%\       OPTICAL  C    O    M     I'    A    X    \ 


PRICES  FOR  UNCUT  LENSES 
PERISCOPIC 

(1.25   CURVE) 

CENTEX 


Object  Target 


Image  as  Seen  Through  Lens 


White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


OVAL 

ROUND 

Per  Dozen  Pairs 

45x35.5  mm 

42  mm 

47  mm 

Stan. 

Rim. 

Stan. 

Rim. 

Stan. 

Rim. 

White 

0.12  to    2.00  1 

$1.50 

$1.60 

$1.75 

$1.90 

$2.00 

$2.25 

2.2.5  to    4.25 

1.75 

1.85 

2.00 

2.15 

2.50 

2.75 

4.50  to    COO 

2.00 

2.10 

2.25 

2.40 

3.00 

3.25 

C .  50  to    8 .  00 

2.50 

2.60 

2.75 

2.90 

3.75 

4.00 

8.50  to  10.00 

+  or  — 

3.50 

10.50  to  13.00 

4.50 

14.00  to  16.00 

6.00 

18.00  to  20.00  J 

7.50 

Smoke  and  Blue 

0.12  to  2.00  1 

2.00 

2.20 

3.00 

3.35 

2.25  to  4.25 

2.50 

2.70 

3.50 

3.85 

4.50to().00     +  °' 

3.00 

3.20 

4.25 

4.60 

6.50  to  8.00  J 

3.50 

3.70 

5.25 

5.60 

Amber 

0.12  to  2.00  1 

2.75 

2.95 

3.50 

3.85 

2.25  to  4.25       , 

3.25 

3.45 

4.25 

4.60 

4.50  to  6.00     "^  °^ 
6.50  to  8.00  J 

4.00 

4.20 

5.25 

5.60 

5.00 

5.20 

6.50 

6.85 

Amethyst  and  Fieuzal 

0.12  to  2.00  1 

3.00 

3.20 

4.00 

4.35 

2 .  25  to  4 .  25  I 

3.50 

3.70 

5.00 

5.35 

4.50  to  6.00     "^  °'" 

4.00 

4.20 

6.00 

6.35 

6.50  to  8. 00  J 

5.00 

5.20 

7.50 

7.85 

EXTRAS 

Lense.s  centered  (center  indicated),  15  cents  per  dozen  pairs  extra. 
Gauged  lenses,  ordered  in  nun  thickness,  which  can  be  selected  from  stocli. 

Oval  50  cents  per  dozen  pajrs  extra. 

42  mm  Round  50  cents  per  dozen  pairs  extra. 

47  mm  Round  75  cents  per  dozen  pairs  extra. 

Gauged  lenses,  ordered  in  mm  thickness,  which  cannot  be  selected  from  stock,  three  times  the  price 
of  regular  lenses. 


57 


B     A     U      S     C      H  &  L     O     M      B       /J5™aoX        OPTICAL  COM     P    A    N    T 


PRICES  FOR  UNCUT   LENSES 
MENISCUS 

(6.00  AND  9.00  CURVE) 

CENTEX 


Object  Target 


Image  as  Seen  Through  Lens 


White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


Per  Dozen  Pairs 


White 

-  6.00  Curve 
0.12  to  2.00 
2 .  25  to  4 .  25 
■1 .  50  to  G .  00 
G.50  to  8.00 


ROUND 


47  mm 


Standard  Rimless 


+ 


+  6.00  Curve 
0.12  to  2.00  1 
2 .  25  to  ■! .  25 
4 .  50  to  (i .  00 
6.50  to  8.00  J 


} 


White 

9.00  Curve 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  (i.OO 
G .  50  to  8 . 00 


4 

50 

G 

00 

7 

50 

1) 

00 

G 

00 

7 

50 

!) 

00 

12 

00 

5.00 
G.50 
8.00 
9.50 


Per  Dozen  Pairs 


Smoke  and  Blue 

6.00  Curve 
0.12  to  2.00 
2.25  to  4.25 
4.50  to  GOO 

G .  50  to  8 . 00  J 


+ 


+ 


+  9.00  Curve 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  G.OO 
G .  50  to  8 .  00 


9.00 
12.00 
15.00 
18.00 


12.00 
15.00 
18.00 
24 .  00 


I  4  6.00  Curv 

G.50       I    0.12  to  2.00 
8.00      i   2.25  to  4.25 


9.50 
12.50 


9.50 
12.50 
15.50 
18.50 


12.50 
15.50 
18.50 
21.50 


4 .  50  to  6 .  00 
G.50  to  8,00  , 

Amber 
-  6.00  Curve 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  GOO 
G.50  to  8.00 


+  6.00  Curve 
0 .  12  to  2 .  00 
2 .  25  to  4 .  25 
4 .  50  to  6 .  00 
6.50  to  8.00 


\  + 


ROUND 

47  mm 

Standard 

Rimless 

$  C.50 

$  7.00 

8.50 

9.00 

10.50 

11.00 

12.50 

13.00 

8 .  50 

9.00 

10.. 50 

11.00 

'       12.50 

13.00 

16.75 

17.25 

8.00 

8.50 

10.50 

11.00 

113.00 

13.50 

15.75 

16.25 

10., 50 

11.00 

U5.00 

13.50 

15.75 

16.25 

21.00 

21.50 

58 


L     O     M      li 


()     I'    'I'    I     <■     A     L 


(■    ()    M     1'    A     X    Y 


PRICES  FOR   UNCUT  LENSES 
MENISCUS 

(6.00   AND   9.00   CURVR) 
(CONTINUED) 

CENTEX 

White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  onlv. 


ROUND 

ROUND 

Per  Dozen  Pairs 

47  mm 

Per  Dozen  Pairs 

47  mm 

Standard 

Rimless 

Standard 

Rimless 

Amethyst 

Fieuzal 

—  6.00  Curve 

-  6.00  Curve 

0.12  to  2.00  ^ 

$  9.00 

$  9.50 

0 .  12  to  2 .  00 

$  9.00 

$  9.50 

2 .  25  to  4 . 2.5 

•  + 

12.00 

12.50 

2.25  to  4.25 

,  _t_ 

12.00 

12.50 

4.50  to  6.00 

15.00 

15.50 

4 .  50  to  6 .  00 

\       15.00 

15.50 

6.50  to  8.00  J 

18.00 

18.50 

6.50  to  8.00 

18.00 

18.50 

+  6.00  Curve 

+  6.00  Curve 

0.12  to  2.00 

12.00 

12.50 

0.12  to  2.00 

12.00 

12.50 

2.25  to  4.25 

15.00 

15.50 

2 .  25  to  4 .  25 

15.00 

15.50 

4.50  to  6.00 

18.00 

18.50 

4 .  50  to  6 .  00 

r 

18.00 

18.50 

6.50  to  8.00 

24.00 

24.50 

6.50  to  8.00 

24.00 

24.50 

EXTRAS 

Lenses,  centered  (center  indicated)  15  cents  per  dozen  pairs  e.xtra. 

Gauged  lenses,  ordered  in  mm  thickness,  which  can  be  selected  from  stock,  $1.50  per  dozen 
pairs  extra. 

Gauged  lenses,  ordered  in  mm  thickness,  which  cannot  be  selected  from  stock,  prices  on 
request. 


59 


B     A     U      S     C      H 


LOME 


OPTICAL 


COM     P    A    N    Y 


PRICES  FOR  UNCUT  LENSES 

FLAT   ROUGH   CYLINDER 

CENTEX 

White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


Per  Dozen  Pairs 


White-Rough 

(Cyl.  side  ground  and  polished) 

0.12  to  2.00  , 

+  or  — 

2  to  2.. 5  mm 

thick 


2 .  25  to  4 .  25 
4.50  to  COO  I 
6.50  to  8.00  J 
0.12  to  2.00  1 
2 .  25  to  4 .  25 
4 .  50  to  C .  00 
6 .  50  to  8 .  00  J 
0.12  to  2.00  1 
2.25  to  4.25  j 
4.50  to  6.00  f 
6 .  50  to  8 .  00  J 
0 .  12  to  2 .  00  1 
2 .  25  to  4 .  25 
4 .  50  to  6 .  00 
6.50  to  8.00 


+  or  — 

3  to  4  mm 

thick 

+  or  — 

5  to  7  mm 

thick 

+  or  — 

8  to  10  mm 

thick 


Smoke-  and  Blue- 
Rough 

(Cyl.  side  ground  and  polished) 
0.12  to  2.00 


2 .  25  to  4 .  25 
4.50  to  6.00 
6.50  to  8.00 
0.12  to  2.00 
2 .  25  to  4 .  25 
4 ,  50  to  6 .  00 
6 .  50  to  8 .  00 
0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00 
6.50  to  8.00 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6.50  to  8.00 


+  or  — 

2  to  2.5  mm 

thick 

I      +  or  — 

3  to  4  mm 

thick 

1       , 

+  or  — 

[  5  to  7  mm 

thick 

1      +  or- 
[  8  to  10  mm 
thick 


SQUARE 


42  mm 


$2.00 
2.50 
3.00 
3.75 
2.25 
2.75 
3.25 
4.00 
2.75 
3.25 
3.75 
4.50 
3.50 
4.00 
4.50 
5.25 


2.75 
3.50 
4.25 
5.25 
3.25 
3.75 
4.50 
5.50 
3.75 
4.50 
5.25 
6.25 
5.00 
5.75 
6.25 
7.25 


ROUND 


47  mm 


$2.50 
3.00 
4.00 
5.00 

2.75 
3.25 
4.25 
5.25 
3.25 
3.75 


6.50 


3.50 
4.25 
5.50 
7.00 
3.75 
4.50 
5.75 
7.25 
4.50 
5.25 
6.50 
8.00 
5.50 
6.25 
7.50 
9.00 


Per  Dozen  Pairs 


Amber-Rough 

(Cyl.  side  ground  and  polished) 
0.12  to  2.00  1 


2 .  25  to  4 .  25 
4.50  to  6.00 
6 .  50  to  8 .  00 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6.50  to  8.00 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6 .  50  to  8 .  00 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6.50  to  8.00 


+  or  — 

2  to  2.5  mm 

thick 

+  or  — 

3  to  4  mm 

thick 

+  or  — 

5  to  7  mm 

thick 

+  or- 

8  to  10  mm 

thick 


Amethyst-  and  Fieuzal- 
Rough 

(Cyl.  side  ground  and  polished) 
0.12  to  2.00 


2 .  25  to  4 .  25 
4.50  to  6.00 
6 .  50  to  8 .  00 
0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00 
6.50  to  8.00 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6.50  to  8.00 
0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00 
6.50  to  8.00 


+  or  — 

2  to  2.5  mm 

thick 

+  or  — 

3  to  4  mm 

thick 

+  or  — 

5  to  7  mm 

thick 

+  or  — 

8  to  10  mm 

thick 


SQUARE 


42  mm 


$3.50 
4.25 
5.25 
6.50 
4.00 
4.75 
5.75 
7.00 
4.75 
5.50 
6.50 
7.75 
6.25 
7.00 
8.00 
9.25 


ROUND 


47  mm 


$  4.50 
5.25 
7.00 
8.75 
5.00 
5.75 
7.50 
9.25 
5.75 
6.50 
8.25 
10.00 
7.00 
7.75 
9.50 
11.25 


5.00 
6.00 
8.00 

10.00 
5.50 
6.50 
8.50 

10.50 
6.50 
7.50 
9.50 

11.50 
8.00 
9.00 

11.00 

13.00 


60 


15    .V    r    s    ('    )i         &         I.    o    M    n     /;^%\      <)    1'    r   i    c   .\   h        <•  o  .m    v  a    .\   v 


PRICES  FOR  UNCUT  LENSES 

FLAT   PLANO-CYLINDER 

CENTEX 


Object  Target 


Image  as  Seen  Through  Lens 


White  lenses  are  siipplierl  regularly  of  our  Crown  Glass. 
Roentgen  and  focu.sed  colored  len.ses  are  made  to  ortler  only. 


SQUARE 

ROUND 

Per  Dozen  Pairs 

42  mm 

47  mm 

Stan. 

Rim. 

Stan. 

Rim. 

White 

0.12  to  2.00  1 

$2.00 

$2.25 

$2.50 

$2.85 

2 .  25  to  4 .  25  [ 
4.50  to  6.00     +"'■ 

2.50 
3.00 

2.75 
3.25 

3.00 
4.00 

3.35 
4.35 

6.50  to  8.00  J 

3.75 

4.00 

5.00 

5.35 

Smoke  and  Blue 

0.12  to  2.00  1 

2.75 

3.10 

3.50 

4.00 

2 .  25  to  4 .  25  1 
4.50  to  6.00  [  +  °'" 
6.50  to  8.00 

3.50 
4.25 

3.85 
4.60 

4.25 
5.50 

4.75 
6.00 

5.25 

5.60 

7.00 

7.50 

Amber 

0.12  to  2.00  1 

3.50 

3.85 

4.50 

5.00 

2.25  to  4.25      , 
4.50  to  6.00     +  °^ 

4.25 
5.25 

4.60 
5.60 

5.25 

7.00 

5.75 
7.50 

6.50  to  8.00  J 

6.50 

6.85 

8.75 

9.25 

Amethyst  and  Fieuzal 

0.12  to  2.00  1 

5.00 

5.50 

2.25  to  4.25 

6.00 

6.50 

4.50  to  6.00     +  "'^ 
6.50  to  8.00  J 

8.00 

8.50 

10.00 

10.50 

EXTRAS 

Lenses,  ordered  in  mm  thickness,  which  can  be  .selected  from  stock,  $1.50  per  dozen  pairs 
extra. 

Gauged  lenses,  ortlered  in  mm  thickness,  which  cannot  be  selectetl  from  stock,  prices  on 
request. 


61 


BAUSCH  &  LOME       /^SS\        O     P    T    I    C    .\    L  C    O    M     P    A    X    Y 


PRICES  FOR  UNCUT  LENSES 
FLAT  SPHERO-CYLINDER  AND  CROSS-CYLINDER 

CENTEX 


Object  Tarcjkt 

White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


Image  as  Seen  Through  Lens 


SOUARE 

ROUND 

Per  Dozen  Pairs 

42  mm 

47  mm 

Stan. 

Rim. 

Stan. 

Rim. 

Sphero-Cylinder 

0.12  to  2.00  1        _ 
2.25  to  4.25     +^  + 

$3.50 
4.50 

$3.85 
4.85 

$4.50 
6.00 

$5.00 
6.50 

4.50  to  6.00          "'' 

6.00 

6.35 

7.50 

8.00 

6.50  to  8.00  J       ^ 

7.50 

7.85 

9.00 

9.50 

0.12  to  2.00  I        _ 
2.25  to  4.25      +^  "~ 

5.00 
6.00 

5.35 
6.35 

6.00 
7.50 

6.50 
8.00 

4.50  to  6.00         ^ 
6.50  to  8.00  J  ~^  + 

7.50 
9.00 

7.85 
9.35 

9.00 
10.50 

9.50 
11.00 

Cross-Cylinder 

0.12  to  2.00  1 

0 .  00 

9.35 

2.25  to  4.25 
4.50  to  6.00 

+  or- 

10.00 
12.00 

10.35 
12.35 

6.50  to  8.00 

15.00 

15.35 

EXTRAS 

Lenses,  ordered  in  mm  thickness,  which  can  be  selected  from  stock,  $1.50  per  dozen  pairs 
extra. 

Gauged  lenses,  ordered  in  nmi  thickness,  which  cannot  be  selected  from  stock,  prices  on  request. 


B     A     U      S     C     II 


L      O      M      R       /V^SS^        O     I'    T    I     ('     A     L  ('    O    M     I'    A     N    Y 


PRICES  FOR  UNCUT  LENSES 
TORIC   ROUGH   CYLINDER 

(6.00  AND  9.00  CURVE) 
(TORIC   SIDE   GROUND   AND   POLISHED) 

CENTEX 

White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


Per  Dozen  Pairs 


SQUARE 


47  mm 


Per  Dozen  Pairs 


SQUARE 


47  mm 


White 

+  6.00  Curve 
0.1'2  to  "2. 00  1 
2 .  25  to  4 . 2.5     2  to  2 . 5  mm 
4.50  to  6.00  thick 

6 .  50  to  8 .  00  I 

0.12  to  2.00] 
2 .  25  to  4 .  25  [  3  to  4  mm 
4 .  50  to  6 .  00  j        thick 
6.50  to  8.00  J 


0.12  to  2.00  1 

2 .  25  to  4 .  25 

5  to  7  mm 

4.50  to  6.00 

thick 

6.50  to  8.00 

0.12  to  2.00] 

2.25  to  4.25 

8  to  10  mm 

4.50  to  6.00 

thick 

6 .  50  to  8 .  00 

1 

White 

—6 

.00  Curve 

0.12  to  2.00] 

2.25  to  4.25 

2  to  2.5  mm 

4.50  to  6.00 

thick 

6 .  50  to  8 .  00  J 

0.12  to  2.00] 

2.25  to  4.25 

3  to  4  mm 

4.50  to  6.00 

thick 

6.50  to  8.00 

0.12  to  2.00' 

2.25  to  4.25 

5  to  7  mm 

4.50  to  6.00 

thick 

6.50  to  8.00 

0.12  to  2.00] 
2.25  to  4.25  [  8  to  10  mm 
4.50  to  6.00  {        thick 
6.50  to  8. 00  J 


&  6.00 

7.50 

9.00 

13.50 

6.75 

8.25 

9.75 

14.25 

7.50 

9.00 

10.50 

15.00 

9.00 
10.50 
12.00 
16.50 


7 .  50 

9.00 

12.00 

18.00 

8.25 

9.75 

12.75 

18.75 

9.00 
10.50 
13.50 
19.50 

10.50 
12.00 
15.00 
21.00 


White 

+  9.00  Curve 
0.12  to  2.00  ] 
2 .  25  to  4 .  25  I  2  to  2.5  mm 
4 .  50  to  6 .  00  tiiick 

6.50  to  8.00  J 


0.12  to  2.00 
2 .  25  to  4 .  25 
4 .  50  to  6 .  00 


3  to  4  mm 
thick 


6.50  to  8.00  J 
0.12  to  2.00  1 

2 .  25  to  4 .  25 

5  to  7  mm 

4 .  50  to  6 .  00 

thick 

6.50  to  8.00 

0.12  to  2.00 
2.25  to  4.25 
4 .  50  to  6 .  00 
U.50  to  8.00 


8  to  10  mm 
thick 


Smoke 

+  6.00  Curve 
0.12  to  2.00  1 
2.25  to  4.25  I  2  to  2.5  mm 
4 .  50  to  6 .  00 
6.50  to  8.00 

0.12  to  2.00  1 
2 .  25  to  4 .  25 
4.50  to  6.00 
6 .  50  to  8 .  00  I 

0.12  to  2.00] 
2.25  to  4.25  I 
4.50  to  6.00  j 
6.50  to  8.00  J 

0.12  to  2.00  1 
2 .  25  to  4 .  25 
4.50  to  6.00 
6.50  to  8.00 


thick 


!>  to  4  mm 
thick 


5  to  7  mm 
thick 


8  to  10  mm 
thick 


$12.00 
15.00 
18.00 
24.00 

13.50 
16.50 
19.50 
25.50 

15.00 
18.00 
21.00 
27.00 

18.00 
21.00 
24.00 
30.00 


8.50 
10.50 
12.50 
16.75 

9 .  50 
11.50 
13.75 
18.25 

10.50 
12.50 
15.00 
19.75 

12.50 
14.75 
17.50 

22.25 


63 


B     A     U      S     C      H 


L     O     M      R 


OPTICAL 


COMPANY 


PRICES  FOR  UNCUT  LENSES 
TORIC   ROUGH   CYLINDER 

(6.00  AND  9.00  CURVE) 

(TORIC  SIDE   GROUND   AND  POLISHED) 

(CONTINUED) 

CENTEX 

White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


Per  Dozen  Pairs 

SQUARE 

Per  Dozen  Pairs 

SQUARE 

47  mm 

47  mm 

Blue 

+   6.00  Curve 

Amethyst 

+   6.00  Curve 

0.12  to  2,00 

$  8.50 

0.12  to  2.00 

$12.00 

2.25  to  4.25     ^l  to  2.5  mm 

10.50 

2 .  25  to  4 .  25     2  to  2 . 5  mm 

15.00 

4.50  to  6.00            thick 

12.50 

4.50  to  6.00  f       thick 

18.00 

6 .  50  to  8 .  00 

16.75 

6.50  to  8.00 

24.00 

0.12  to  2.00 

9.50 

0.12  to  2.00 

13.50 

2 .  25  to  4 .  25     :?  to  4  mm 

11.50 

2 .  25  to  4 .  25  [  3  to  4  mm 

16.50 

4.50  toC.OO  1       thick    - 

13.75 

4 .  50  to  0 .  00          tliick 

19.50 

6.50  to  8.00  . 

18.25 

6 .  50  to  8 .  00 

25.50 

0.12  to  2.00 

10.50 

0.12  to  2.00  1 

15.00 

2 .  25  to  4 .  25     5  to  7  nun 

12.50 

2.25  to  4.25     5  to  7  mm 

18.00 

4 .  50  to  6 .  00          thick 

15.00 

4 .  50  to  6 .  00          tliick 

21.00 

6.50  to  8.00 

19.75 

6 .  50  to  8 .  00 

27 .  00 

0.12  to  2.00 

12.50 

0.12  to  2.00 

18.00 

2.25  to  4.25     8  to  10  mm 

14.75 

2.25  to  4.25     8  to  10  mm 

21.00 

4 .  50  to  6 .  00           thick 

17.50 

4 .  50  to  6 .  00           thick 

24.00 

6.50  to  8.00  J 

22.25 

6.50  to  8.00  J 

30.00 

Amber 

Fieuzal 

+   6.00  Curve 

+   6.00  Curve 

0.12  to  2.00  1 

10. 50 

0.12  to  2.00  1 

12.00 

2 .  25  to  4 .  25     2  to  2 . 5  mm 

13.00 

2 .  25  to  4 .  25     2  to  2 . 5  mm 

15.00 

4.50  to  6.00           thick 

15.75 

4.50  to  6.00            thick 

18.00 

6.50  to  8.00  J 

21.00 

6 .  50  to  8 .  00  J 

24.00 

0.12  to  2.00  1 

11.75 

0.12  to  2.00  1 

13.50 

2 .  25  to  4 .  25     3  to  4  mm 

14.50 

2 .  25  to  4 .  25  [  3  to  4  mm 

10.50 

4 .  50  to  6 .  00          thick 

17.25 

4.50  to  6.00          thick 

19.50 

6 .  50  to  8 .  00 

22.50 

6.50  to  8.00  j 

25.50 

0.12  to  2.00  1 

13.00 

0.12  to  2.00  1 

15.00 

2 .  25  to  4 .  25     5  to  7  mm 

16.00 

2.25  to  4.25     5  to  7  mm 

18.00 

4.50  to  6.00          tliick 

19.00 

4.50  to  6.00          thick 

21.00 

6 .  50  to  8 .  00  J 

24.50 

6.50  to  8.00  J 

27 .  00 

0.12  to  2.00  1 

15.50 

0.12  to  2.00  1 

18.00 

2.25  to  4.25     8  to  10  mm 

18.50 

2.25  to  4.25     S  to  10  mm 

21.00 

4.50  to  6.00           thick 

21.50 

4.50  to  6.00  j        thick 

24.00 

6.50  to  8.00  j 

27.00 

6.50  to  8.00  J 

30.00 

64 


r,     A     T      S     C      II  &  L     O     M      B       /^So5\        OPTICAL  COMPANY 


PRICES  FOR  UNCUT  LENSES 
TORIC   PLANO-CYLINDER 

(6.00  AND  9.00  CURVE) 

CENTEX 


Object  Target 


Image  as  Seen  Through  Lens 


White  lenses  are  supplietl  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


Per  Dozen  Pairs 


Piano-Cylinder  White 

+  6.00  Curve 
O.l^  to  '■2.00  1 
2 .  25  to  -1 .  25 
4.50  to  6.00 
6.50  to  8.00 


+ 


+  6.00  Curve 
0.12  to  2.00  1 
2.25  to  4.25     _ 
4.50  to  6.00  ■    ■ 

6.50  to  8.00  J 

+  9.00  Curve 
0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00 
6.50  to  8.00  J 


+ 


SQUARE 


47  mm 


Stan. 


i  9.00 
12.00 
15.00 
18.00 


12.00 
15.00 
18.00 
24.00 


18.00 
21.00 
24.00 
30.00 


Rim. 


&  9.50 
12.50 
15 .  .50 
18.50 


12.50 
15.50 
18.50 
24.50 


18.50 
21.50 
24.50 
30.50 


Per  Dozen  Pairs 


+ 


Amber 
0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00 
6 .  50  to  8 .  00 


+ 


Fieuzal  and  Amethyst 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6.50  to  8.00  J 


+ 


SQUARE 


47  mm 


Stan. 


Piano-Cylinder  Colored 

+  6.00  Curve 
Blue  and  Smoke 
0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6 .  50  to  8 .  00 


Rim. 


$12.60 
16.80 
21.00 
25.20 

15.75 
21.00 
26.25 
31.50 


$13.10 
17.30 
21.50 
25.70 

16.25 
21.50 
26.75 
32 .  00 


18.00  18.50 

24.00  24.50 

30.00  !  30.50 

36.00  I  36.50 


EXTRAS 

Gauged  lenses,  ordered  in  millimeter  thickness,  which  can  be  selected  from  stock,  $1.50  per 
dozen  pairs  extra. 

Gauged  lenses,  ordered  in  millimeter  thickness,  which  cannot  be  selected  from  stock,  prices 
on  request. 


6i! 


B     A     TT      S     C      II  fc  L      O      M      B       /^^I^X        OPTICAL  COMPANY 


PRICES  FOR  UNCUT  LENSES 
TORIC   SPHERO-CYLINDER 

(  6.00  AND  9.00  CURVE  ) 

CENTEX 


Object  Target 


Image  as  Seen  'J'hrouch  Lens 


Wliite  lenses  are  supplied  regularly  of  oiu"  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


Per  Dozen  Pairs 


Sphero-Cylinder  White 

+  6.00  Curve 

+  0  + 

0.12  to  2.00  C  ( 
2.25  to  4.25  C  [ 


SQUARE 


47  mm 
Stan.      Rim. 


0  12  to  (5  00S'''^^0.50$11.00 
u.iz  too. uu  S     jg^^y,    j^^^Q 


—  6.00  Curve 

+  O  + 
0.12  to  2.00  C 


2.25  to  4.25  C 


-0.12  to  0.00  S 


+  9.00  Curve 


0.12  to  2.00  C 
2.25  to  4.25  C 


0.12  to  G.OO  S 


+  6.00  Curve 
0.12  to  2.00  C  / 


+ 


2.25  to  4.25  C 
0.12  to  2.00  C 
2.25  to  4.25  C 


0.12  to  2.00  S 


13.25 
15.75 


21.00 
23.50 


12.00 
15.00 


13.75 
16.25 


21.50 
24.00 


12.50 
15.50 


0.12  to  2.00  C(  ^    15.00    15.50 


—  6.00  Curve 


0.12  to  2.00  C  (  ^  TO  f    o  on  G    13.25 
2.25  to  4.25  Cj  0-1^  t«  ^-00  S    15.75 


13.75 
16.25 


Per  Dozen  Pairs 


Sphero-Cylinder  Colored 

+  6.00  Curve 
Blue  and  Smoke 

+  0  + 
0.12  to  2.00  C 
2.25  to  4.2.'! 


SQUARE 


47  mm 


Stan. 


Rim. 


'OCjniot     p  nnG$14.70$15.20 
,,(.J0.12to6.00S    jg2o|   jg^o 


0.12to2.00C)Q  j2       2  QQO  14.70!  15.20 

2.25  to  4.25  C  p-^"^  ^°  "^""^^  18.20  18.70 

0.12  to  2.00  C  (  2  25  to  4  25  S  ^^"'^^  ^^'^^ 

2.25  to  4.25  C  p-^""  ^°  *.^oo  21  00  21.50 

Amber 

+  0  + 

0.12  to  2,00  C  (  ,,  ,a  f     p  no  e  18-40  18.90 

2.25  to  4.25  C     ^^^'  ^°  ^  "^  ^  22.75  23.25 


0.12  to  2.00  C 
2 . 25  to 
0.12  to  2.00  C  / 
2.25  to  4.25  C  f 


^;<«M„^„.„,.„os^ 


2.25  to  4.25  S 


18.40 
22.75 
21.90 
26.25 


Fieuzal  and  Amethyst 

+  O  + 
0.12  to  2.00  C 


2.25  to  4.25  C 


0.12  to  6.00  S 


21.00 
26.00 


0.12to2.00C^Q  j2to2  00  S  ^^'^^ 

2.25  to  4.25  C  i  ^  -^  ^    ^.uuo  2(j  qo 

0.12  to  2.00  C  [2  25  to  4  25  S  ^^'^^ 

2.25  to  4.25  C  J  "^'^    ^  I  30.00 


18.90 
23.25 
22.40 
26.75 


21.50 
26.50 

21.50 
26.50 
25.50 
30.50 


EXTRAS  —  Gauged  lenses,  ordered  in  millimeter  thickness,  which  can  be  selected  from  stock, 
$1.50  per  dozen  pairs  extra. 


n     A     U      R     C      IT  Sc  L     O     M      n       /$^:^£^       OPTICAL  COMPANY 


PRICES  FOR  UNCUT  LENSES 

ROUGH,  PLANO,  SPHERO   AND   CYLINDER 

PRISMS 

CENTEX 


White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Prices  for  edging  prisms  may  be  found  on  page  110. 


Per  Dozen  Pairs 


Rough 

(One  side  ground  and  polished) 
0.50  to    3.50A  ] 

4.00  to    7.00A  U2  to  2.5  nun  tiiifk      . 
8.00  to  lO.OOA  J 

0.50  to    3.50A  1 

4.00  to    7.00A     3  to  4  mm  tliick      .    . 

8.00  to  lO.OOA  J 

0.50  to    3.50A  1 

4.00  to    7. 00 A     5  to  7  mm  thick      .    . 

8.00  to  lO.OOA  J 

0.50  to    3.50A  1 

4.00  to    7. 00 A     H  to  10  mm  thick    .    . 

8.00  to  lO.OOA 


07 


BAUSCn  &  LOMn       /^i^       OPTICAL  COMPANY 


PRICES  FOR  UNCUT  LENSES 

ROUGH,  PLANO,  SPHERO   AND   CYLINDER 

PRISMS 

(CONTINUED) 

CENTEX 


SQUARE 

Per  Dozen  Pairs 

42  mm 

Standard 

Rimless 

Piano 

(Both  sides  ground  and  polished) 
0  50  to    3  50  A                   

$3.75 
4.25 
5.00 
6.00 
9.00 

13.50 

5.00 
6.00 

7.50 
9.00 

$4  25 

4  00  to    7  00  A 

4.75 

8  00  to  10. 00 A 

5.50 

11  00  to  13  00  A 

14  00  to  16  00  A      .    .    .    '. 

17.00  to  20,00A 

Sphero  Prisms 

0.50  to  3.50A 

0.12  to  2.00  S 

5.50 

2 .  25  to  4  25  S 

6  50 

Cylinder  Prisms 

0.50  to  3.50A 

0.12  to  2.00  C 

8.00 

2.25  to  4.25  C 

9.50 

68 


B     A     TT      S     C     II 


L     O     M     n 


OPTICAL 


COMPANY 


PRICES   FOR   EUPHOS   LENSES 

(47  mm  ROUND  ) 

CENTEX 


Per  Pair 


Periscopic 


0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6 .  50  to  8 .  00 


0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  GOO 
6 .  50  to  8 .  00 


+  or 


Meniscus 
6.00  Curve 


Flat  Rough  Cylinder 


0.12  to  2.00  1 
2 .  25  to  4 .  25  I 
4 .  50  to  G .  00  } 
G.50  to  8.00  J 


+  or  — ,  2  to  4  inin  tliick 


Flat  Piano  and  Sphero-Cylinder 

0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
G .  50  to  8 .  00 


+  or 


0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00 
6 .  50  to  8 .  00 


Toric  Rough  Cylinder 
6.00  Curve 

+  or  — ,  2  to  4  mm  tliitk 


Toric  Piano  and  Sphero-Cylinder 


0.12  to  2.00 
2.25  to  4.25 
4 .  50  to  6 .  00 
6.50  to  8.00 


+  or- 


Uncut 


$0.75 

.85 

1.00 

1.25 


1 .  50 
1.75 
2.00 
2.25 


1.25 
1.50 
1.75 
2.00 


1.50 
1.75 
2.00 
2.25 


1.75 
2.00 
2.25 
2.50 


2.50 
2.75 
3.00 
3.25 


EXTRA   FOR   PRISMS 

Peri.scopic  and  Meniscu.s,  $0 .  75  jjcr  pcair. 

Flat  and  Toric  Cylinder  and  Sphero-Cylinder,  $0.75  per  pair. 


Edged 


$1.00 
1.10 
1.25 
1.50 


1.75 
2 .  00 
2.25 
2.50 


1.75 
2.00 
2.25 
2.50 


3.00 
3.35 
3.60 


Edged  and 
Drilled 


$1.25 
1.35 
1.50 
1.75 


2.00 
2.25 
2.50 
2.75 


2.00 
2.25 
2.50 

2.75 


3.00 
3.25 
3.60 
3.85 


69 


B     A     TT      S     C     II  &  L     O     M     B       /^^^\       OPTICAL  COMPANY 


PRICES   FOR   CROOKES   LENSES 

(47  mm  ROUND) 

CENTEX 


Per  Pair 


0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00 
6 .  50  to  8 .  00 


Periscopic 


+  or 


Meniscus 
6.00  Curve 


0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6.50  to  8.00 


0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6.50  to  8.00 


+  or 


Flat  Rough  Cylinder 


+  or 


2  to  4  mm  thick 


Flat  Piano  and  Sphero-Cylinder 

0.12  to  2.00  1 

2.25  to  4.25 

4.50  to  6.00 

6 .  50  to  8 .  00 


+  or 


Toric  Rough  Cylinder 


0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  6.00 
6 .  50  to  8 .  00 


+  or  — ,  2  to  4  mm  tliiek 


Toric  Piano  and  Sphero-Cylinder 

0.12  to  2.00  1 

2.25  to  4.25 

4.50  to  6.00 

6.50  to  8.00 


+  or 


Uncut 


$1.00 
1.10 
1.25 
1.50 


2.00 
2.25 
2.50 
2.75 


1.50 
1.75 
2.00 
2.25 


2.00 
2.25 
2.50 

2.75 


2.50 
2.85 
3.20 
3.55 


3.00 
3.35 
3.70 
4.05 


Edged 


$1.25 
1.35 
1.50 
1.75 


2.25 
2.50 
2.75 
3.00 


2.25 
2.50 
2.75 
3.00 


3.25 
3.60 
4.05 
4.40 


Edged  and 
Drilled 


$1.50 
1.60 
1.75 
2.00 


2.50 
2.75 
3.00 
3.25 


2.50 
2.75 
3.00 
3.25 


3.50 
3.85 
4.30 
4.65 


EXTRA    FOR   PRISMS 

Periscopic  and  Meniscus,  $1 .  00  per  pair. 

Flat  and  Toric  Cylinder  and  Sphero-Cylinder,  $1 .  00  per  pair. 


70 


B     A     V      S 


L      ()      M      H 


O     I'    T     I     r     A     1, 


(•    <)     M     !• 


PRICES   FOR   NOVIOL   LENSES 


47  mm  ROHM) 

CENTEX 


Per  Pair 


Periscopic 


0.12  to  2.00 
2.25  to  4.25 
4 .  50  to  C .  00 
6.50  to  8.00 


0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00 
6 .  50  to  8 .  00 


Meniscus 

6.00  Curve 


+  or 


Flat  Rough  Cylinder 


0.12  to  2.00  1 
2 .  25  to  4 .  25  I 
4 .  50  to  6 .  00  i 
6.50  to  8.00  J 


or  — ,  2  to  4  mm  thick 


Flat  Piano  and  Sphero-Cylinder 

0.12  to  2.00  1 

2 .  25  to  4 .  25  ' 

4.50  to  6.00 

6.50  to  8.00 


+  or  — 


Toric  Rough  Cylinder 


0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00 
6.50  to  8.00 


+  or  — ,  2  to  4  mm  thick 


Toric  Piano  and  Sphero-Cylinder 

0.12  to  2.00] 

2.25  to  4.25 

4.50  to  6.00 

6.50  to  8.00 


+  or  — 


Uncut 


$3.00 
3.10 
3 .  25 
3.50 


3.00 
3.10 
3.25 
3.50 


3.50 
3.75 
4.00 
4.25 


4.00 
4.25 
4.50 

4.75 


3.50 
3.75 
4.00 
4.25 


4.00 
4.25 
4.50 
4.75 


EXTRA  FOR  PRISMS 

Periscopic  and  Meniscus,  $1 .  50  per  pair. 

Flat  and  Toric  Cylinder  and  Sphero-Cylinder,  $1 .50  per  pair. 


Edged 


$3 .  50 
3.60 
3 .  75 
4.00 


3.50 
3.60 
3.75 
4.00 


4.75 
5.00 
5.25 
5.50 


4.75 
5.00 
5.25 
5.50 


Edged  and 
Drilled 


$3 .  90 
4,00 
4.15 
4 .  40 


3.90 
4.00 
4.15 
4.40 


5.15 
5.40 
5.65 
5.90 


5.15 
5.40 
5.65 
5.90 


71 


B     A     r      ,S     C      H  &  I.     O     M      B       /@!2^        O     P    T    I     C    .\    L  C    O    M     P    A    N    Y 


PRICES   FOR   AUTO   GOGGLE   LENSES 
CENTEX 


These  lenses  are  cut  from  ground  and  polished  Piano  Meniscus  6.00  Curve  lenses  and  are 
edged  to  shape  illustrated  above,  or  any  similar  shape. 
White  lenses  are  supplied  regularly  of  our  Crown  Glass. 
Roentgen  and  focused  colored  lenses  are  made  to  order  only. 


Cut  from  63  mm  Round 

Cut  from  71  mm  Round 

Per  Dozen  Pairs 

Edged 

Edged  and  Drilled, 
6  Holes  to  the  Pair 

Edged 

Edged  and  Drilled, 
6  Holes  to  the  Pair 

White 

Smoke 

Amber 

Amethyst 

Fieuzal 

$12.75 
16.50 
20.25 
23.00 
23.00 

$14.25 
18.00 
22.50 
25.25 
25.25 

$15.00 
18.75 
24.50 
27.75 
27.75 

$16.50 
20.25 
26.75 
30.00 
30.00 

72 


B     .\     U      S     C      H 


L     O     M      B 


O     I'    T    I    C    .\     h 


<■    ()    M     P    A    N    Y 


PRICES  FOR  UNCUT  LENSES 
MENISCUS,    CYLINDER    AND   SPHERO-CYLINDER 

PRIMEX 

(47  mm   ROUND) 

Umbral  are  coloretl  focused  lenses,  which  we  .supply  in  Smoke,  Amber  and  Euphos  only. 

Smoke  is  supplied  in  four  shades,  having  ab.sorptions  of  25%  (A),  50%  (B),  65%,  (C),  and 
80%  (D),  respectively,  while  Amber  is  supjilied  in  two  shades,  light  (A)  and  dark  (B),and  Euphos 
in  one  shade  (A)  only. 

Umbral  Meniscus  Rough  are  supplied  with  either  the  +  or  —  6.00  D  curve  side  finished. 

Prices  for  edging  Primex  lenses  are  listed  on  page  74. 


White 

Per  Pair 

Umbral 

Per  Pair 

Meniscus 

Meniscus 

0.12  to  2.00 
2 .  25  to  4 .  25 
4 .  50  to  6 .  00 

+  or  - 

$1.25 
1..50 
1.75 

Rough 

4  to  5  mm  thick 

Meniscus 

$3.00 

6.50  to  8.00  J 

2.25 

0.25  to  2.00  1 

3.00 

Toric  PI 

0.12  to  2.00 

ano-Cyiinder 

1.50 

2 .  25  to  4 .  25 

4.50  to  6.00  f       °'' 

6.50  to  8.00  J 

3.00 
3.00 
3.00 

2 .  25  to  4 .  25 
4 .  50  to  6 .  00 
6 .  50  to  8 .  00 

+  or- 

1.75 
2.25 

2.75 

Toric  Piano-Cylinder 

0.25  to  2.00  C  1 
2.25  to  4.25  C  J         ■" 

3.75 
3.75 

Toric  Sphero-Cylinder 

Toric  Sphero-Cylinder 

j^  c^  ^^  -  c^  -^ 

+  o  +,  -  o  -, 

+  O  -  or  -  O  + 

+  O  -  or  -  O  + 

0.12  to  2.00  S] 

1.75 

0.12  to  2.00  S) 

4.50 

4.25  to  4.25  S     0.12  to  2.00  C 

2.00 

2.25  to  4.25  S     0.25  to  2.00  C 

4.50 

2.50  to  6,00  S 

2.25 

4.50  to  6.00  S  J 

4.50 

0.12  to  6.00  S  1 

2.00 

0.12  to  2.00  S  ] 

4.50 

2.25  to  4.25  S     2.25  to  4.25  C 

2.25 

2.25  to  4.25  S     2.25  to  4.25  C 

4.50 

4.50  to  6.00  S  J 

2.75 

4.50  to  6.00  sj 

4.50 

73 


B     A     U      .S     C      H  &  L     O      M      B       /^SSSx        O     P    T    I    C    A    L  CO    .M     1>    A    N    Y 


PRICES  FOR   BEVEL  AND  RIMLESS  EDGING 

MENISCUS,  CYLINDER   AND   SPHERO- CYLINDER 

LENSES 

PRIMEX 

These  lenses  are  centered  for  each  size  of  eye  (center  indicated)  and  are  gauged  to  fit  about 
a  If  millimeter  strap. 

(To  be  added  to  prices  of  White  Lenses) 


Per  Pair 

1 

0 

00 

000 

000^ 

0000 

o 

XI 

g 

3 

DRILLING 

2  Holes 

3  Holes 

4  Holes 

Meniscus 

6.00  Curve 

0.12  to  8.00+  or - 

$0.15 

$0.15 

$0.20 

$0.25 

$0.25 

$0.30 

$0.30 

$0.05 

$0.10 

$0.15 

Toric  Piano-Cylinder 

0.12  to  8.00  +  or  - 
Axes  90°  and  180° 

.20 

.20 

.25 

.30 

.30 

.35 

.35 

.05 

.10 

.15 

0.12  to  8.00  +  or- 
Other  Axes 

.25 

.25 

.30 

.35 

.35 

.40 

.40 

.05 

.10 

.15 

Toric  Sphero-Cylinder 

+  o  +  ,  -  o  -, 

+  O  —  or  -   O   + 

0.12  to  6.00  S  O  0.12  to 

2.00  C 

.20 

.20 

.25 

.30 

.30 

.35 

.35 

.05 

.10 

.15 

0.12  to  6.00  S  O  2.25  to 

4.25  C 

.25 

.25 

.30 

.35 

.35 

.40 

.40 

.05 

.10 

.15 

(To  be  added  to  prices  of  Umbral  Lenses) 


EDGING 

0 

z 

Per  Pair 

0.12 

to 

2.00 

2.25 

to 

4.25 

$0.50 
.50 
.75 

4.50 

to 

6.00 

6.50 

to 

8.00 

p 

Meniscus 

$0.50 
.50 
.75 

$0.50 
.50 

.75 

$0.50 
.50 
.75 

$0  40 

Flat  Cylinder  and  Sphero-Cylinder    .    . 
Toric  Cylinder  and  Sphero-Cylinder 

.40 
.40 

Above  prices  refer  to  lenses  of  all  shapes  shown  in  illustrations  on  pages  86  to  91. 

74 


I?     A     V      S     (• 


L     O      M      ]{ 


()     r    T    I     (•    A    L 


(•    ()    M     I'    A     N    Y 


PUNKTAL   LENSES 

CORRECTED  for  astigmatism  in  all  powers  throughout  an  anguhir  field  of 
view  of  G0°,  Punktal  lenses  represent  the  greatest  achievement  yet 
attained  in  ophthalmic  optics  and  one  of  the  most  notable  conlrihu- 
tions  to  general  optics  since  the  introduction  of  the  photographic  anastigmat. 
They  are  the  outcome  of  much  research  on  the  part  of  optical  scientists  and 
producers,  who  have  long  recognized  the  importance  of  obtaining  lenses 
corrected  to  permit  as  accurate  and  distinct  vision  through  the  margin  as 
through  the  center  but  have  hitherto  failed  to  solve  the  problems  involved. 

The  word  "Punktal"  is  of  German  origin,  meaning  in  this  application  a 
lens  which  reproduces  any  given  definite  point  of  an  object  as  a  distinct  point 
in  the  image — in  other  words,  a  lens  which  gives  equally  clear  definition  at  all 
points  of  its  field. 

The  value  of  such  an  optical  property  is  easily  apparent  when  it  is  considered 
that  the  eye  in  normal  vision  does  not  remain  stationary  in  its  socket  but  can 
be  rotated  through  an  angle  of  nearly  180°.  Heretofore  it  has  been  impossible 
with  glasses  to  utilize  anything  like  a  natural  field  satisfactorily,  as  no  lens 
would  give  a  field  of  more  than  15°  around  its  axis  without  some  astigmatism 
of  oblique  pencils. 


Fig.  1 


To  eliminate  this  unnatural  restriction  was  the  problem  of  the  scientists, 
until  at  length  Dr.  Moritz  von  Rohr,  of  the  scientific  stafl^  of  Carl  Zeiss,  our 
associates  at  Jena,  Germany,  arrived  at  a  practical  solution  after  extensive 
investigations  and  published  his  findings  in  1911.  He  recognized  the  impos- 
sibility of  eliminating  all  astigmatism  when  using  a  common  base  curve  for 

75 


C     A     U      S     C      II 


L     O     M     n 


OPTICAL 


<;    O    M     P    A     N    Y 


all  powers,  or  when  employing  any  base  curve  system,  but  accomplished  his 
purpose  by  computincj  separately  the  curves  required  to  correct  each  power. 

The  result  is  the  Punktal  lens,  which  widens  the  field  of  astigmatic  correc- 
tion to  60°  in  all  powers.  The  advantage  of  this  is  especially  obvious  when 
one  takes  into  consideration  the  large  eye  sizes  of  lenses  so  much  in  vogue  at 
the  present  time.  It  is  eminently  desirable  that  as  much  of  this  larger  lens 
surface  as  possible  be  corrected  to  give  clear  vision,  in  order  to  insure  greatest 
satisfaction  to  the  customer. 

The  accompanying  illustrations  demonstrate  the  superiority  of  Punktal 
lenses  more  strikingly  than  any  extended  description.  Figure  1  represents 
the  opposite  extremes  of  optical  correction,  showing  a  rectilinear  target  photo- 
graphed first  through  different  parts  of  an  ordinary  sphero-cylindrical  lens 
of  +  3.00  spli.  combined  with  +  2.00  D  cyl.  (A),  and  then  similarly  through 
a  Punktal  lens  of  like  powers  (B). 

The  vertical  row  of  targets  in  each  illustration  re})resents  the  images  obtained 
when  the  eye  is  rotated  within  the  plane  containing  the  axis  of  the  cylinder ;  the 
horizontal  row,  when  the  eye  is  rotated  at  right  angles  to  the  axis  of  the  cylinder ; 
and  the  diagonal  rows,  when  the  eye  is  rotated  at  45°  to  the  axis  of  the  cylin- 
der. The  length  of  each  row  measures  on  the  lens  an  anole  of  60°,  liisected 
by  the  central  line  of  sight.  The  central  image  is,  of  course,  satisfactory 
through  either  lens.  Through  the  ordinary  lens  the  astigmatism  is  very  pro- 
nounced outside  the  plane  containing  the  axis  of  the  cylinder,  while  through 
the  Punktal  lens  all  images  are  equally  sharp. 


Fig.  2 
While    Fig.    1     represents,    perhaps,    the     more     significant    comparison, 
because  of  the  fact  that  the  majority ^of  lenses  worn  are  still  of  the  flat  type, 


76 


L      ()      ^\      ]!        /^^^        O     I'    '!'     1     C     A     L  CO    M     I'    A     X    Y 


we  show  in  Fin;.  '■2  a  like  eoin|)arison  resullino-  from  pholo^raj)li.s  of  tlie 
same  taro^et  taken  tlirouoh  an  ordinarv  O.OO  D  base  Torie  lens  of  +  4.00  D  eom- 
hined  with  +  '■2. 00  1)  and  thronnh  a  I'nnktal  lens  of  the  same  radii.  While 
the  eomparison  in  this  case  is,  of  eourse,  not  so  marked,  yet  ((nile  a  difference 
can  be  noted  between  the  horizontal  and  vertical  lines  of  the  IPs  near  the 
margin  of  the  ordinarv  Toric  lens — astigmatism — while  all  of  the  iniagcvs  in 
the  field  of  the  Pnnktal  lens  are  of  e(iual  (jnality  with  that  in  the  center. 

That  such  results  cannot  be  obtained  with  any  system  employing  a  restricted 
number  of  diflFerent  base  curves,  each  common  to  several  powers,  is  very 
evident,  as  is  the  impracticability  of  carrying  a  stock  of  rough  lenses  and  the 
tools  for  each  of  the  different  base  curves  which  would  be  rec|uired.  At 
best  such  a  system,  according  to  the  indisputable  laws  of  optics,  can  only  be 
an  approximation  of  the  ideal  atyorded  by  the  Pnnktal  series  of  finished  lenses. 

These  new  lenses  are  made  only  in  the  deep  curved  forms ;  they  are  just  as 
simple  in  application  as  the  ordinary  types  and  do  not  require  any  large 
investment.  They  have  been  patented  in  the  astigmatic  corrections  and  the 
name  "Punktal"  registered  as  a  trade  mark  in  the  United  States.  Detailed 
information  as  to  the  principles  involved  can  be  obtained  from  U.  S.  Patent 
No.  989,645,  issued  to  Dr.  von  Rohr,  of  the  Carl  Zeiss  Works.  In  instigating 
the  preliminary  investigations  and  meeting  the  problems  of  practical  manu- 
facture, we  have  co-operated  with  the  Carl  Zeiss  Works,  and  our  relationship 
with  them  gives  us  the  exclusive  manufacturing  rights  for  the  American 
continent. 

We  furnish  Punktal  lenses  with  both  sides  finished,  as  the  cost  of  work- 
manship of  the  grade  required  and  the  multitude  of  necessary  tools  render  it 
unprofitable  to  grind  the  second  side  on  a  small  scale.  The  product  comes 
within  the  range  of  precise  optics,  since,  in  addition  to  the  astigmatic  correc- 
tion, they  offer  a  higher  degree  of  accuracy  in  focus  and  centering  than  the 
best  of  the  lenses  previously  on  the  market.  Hence,  as  a  guarantee  of  their 
genuineness  and  of  the  uniformly  high  quality  of  their  workmanship,  we 
engrave  a  minute  reproduction  of  our  trade  mark  on  one  of  the  surfaces,  near 
the  margin  of  each  lens.  This  trade  mark  is  too  faint  to  interfere  with  vision 
or  to  be  detected  clearly  without  the  aid  of  a  magnifier. 

For  more  extended  details  regarding  Punktal  lenses  we  refer  to  Pamphlets 
Nos.  5  and  6,  of  our  Scientific  and  Technical  Publications.  The  former 
treats  of  "Punktal  Lenses,  Their  Advantages  and  Application  to  Present 
Day  Methods,"  while  the  subject  of  the  latter  is  "The  Significance  of  Punktal 
Lens  Principles  in  Application  to  the  Eye."     (See  page  147.) 


77 


U      S     C      II  &  L     O     M      B       /C^£^        O     I'    T    1     ('    A 


L  COM     r    A    X    Y 


PRICES   FOR  PUNKTAL   LENSES 
SPHERO,  CYLINDER  AND  SPHERO-CYLINDER 


(47  mm  ROUND) 
WHITE 


Object  Target 


Image  as  Seen  Through  Lens 


These  lenses  are  made  anfl  sold  under  U.  S.  Patent  No.  989,645  to  Carl  Zeiss,  Jena,  and  under 
the  trade  name  "Punktal"  (Registered  U.  S.  Patent  Office  No.  93,577,  Sept.  23,  1913). 


Edged  and  Drilled 

Minimum 

Per  Pair 

Uncut 

Edged 

Retail 
Prices 

2  Holes 

3  Holes 

4  Holes 

Meniscus 

Net. 
Per  Pair 

0.12  to  2.00  1 

2.25  to  4.25  [  + 

$2.00 

$2.35 

$2.55 

$2.65 

$2.75 

$5 .  00 

2.25 
2.50 

2.60 

2.85 

2.80 
3.05 

2.90 
3.15 

3.00 
3.25 

5 .  00 

4 .  50  to  7 . 50  ) 

5 .  00 

0.12  to    2.00 

2.00 

2.35 

2.55 

2.65 

2.75 

5.00 

2.25  to    4.25 

2.25 

2.60 

2.80 

2.90 

3.00 

5 .  00 

4.50  to    8.00     - 

2.50 

2.85 

3.05 

3.15 

3.25 

5 .  00 

8.. 50  to  13.00 

2.75 

3.10 

3.30 

3.40 

3.50 

7.50 

14.00  to  20.00  J 

3.00 

3.35 

3.55 

3.65 

3.75 

7.50 

Toric  Piano-Cylinder 

0.12  to  2.00  I 

3.00 

3.50 

3.80 

3.95 

4.10 

7.50 

2 .  25  to  4 .  00  j  +  or  - 

3.75 

4.25 

4.55 

4.70 

4.85 

7.50 

Toric  Sphere-Cylinder 

+  0+,-0  -,  +  O  -  or-  O  + 

0.12  to  2.00  Si 

2.25  to  4.25  SO.  12  to  2.00  (\    .    . 

3.00 

3.50 

3.80 

3.95 

4.10 

7.50 

4.50  to  7.50  S  ) 

0.12  to  2.00  S) 

2 .  25  to  4 .  25  S  -  2 .  25  to  4 .  00  C  .    .    . 

3.75 

4.25 

4.55 

4.70 

4.85 

7.50 

4 .  50  to  7 .  50  S  ) 

0.12  to  2.00  S  ) 

2 . 25  to  4 . 25  S  [  0\er  4 . 00  C  . 

4.50 

5.00 

5.30 

5.45 

5.60 

7.50 

4.50  to  7.50  S  ) 

EXTRA   FOR   PRISMS 

Sphere,  $1.00  per  pair ;  Cylinder,  $2.00  per  pair. 


78 


n   A   V 


L     O     M      I! 


O     P    T    I    (•    A    L 


I'    O    M     I'    A    X    Y 


PRICES   FOR  PUNKTAL  LENSES 
SPHERO,  CYLINDER   AND  SPHERO  CYLINDER 

UMBRAL,  CROOKES  AND  NOVIOL 

(47  mm   ROUND) 

These  lenses  are  made  and  sold  under  U.  S.  Patent  No.  989,(1-1.)  to  Carl  Zeiss,  Jena,  and  under 
the  trade  name  "Punktal"  (Rc<,nstered  U.  S.  Patent  Office  No.  9.'5,.577,  Sept.  2:5,  19i;5). 

Umbral  are  colored  focused  lenses,  which  we  supjily  in  Smoke,  Amber  and  EujjIios  only. 

Smoke  is  sui)j)lied  in  four  shades,  having  aksorptions  of  25%  (A),  50%  (B),  G5%  (C)  and  80% 
(D),  respectively,  while  Amber  is  supplied  in  two  shades,  light  (A)  and  dark  (B),  and  Euphos 
in  one  shade  (A)  only. 


Edged  and  Drilled 

Per  Pair 

Uncut 

Edged 

2  Holes 

3  Holes 

4  Holes 

Meniscus 

0.12  to  2.00] 

2.25  to  4.25     + 

$5.00 

$5.50 

$5.90 

$5.90 

$5.90 

4.50  to  7.50 

0.12  to    2.00 

5.00 

5.50 

6.00 

6.00 

6.00 

2.25  to    4.25 

5.50 

6.00 

6.50 

6.50 

6.50 

4  50  to    8.00 

— 

6.00 

6.75 

7.25 

7.25 

7.25 

8.50  to  13.00 

6.75 

7.50 

8.00 

8.00 

8.00 

14.00  to  20. 00 

7.50 

8.25 

8.75 

8.75 

8.75 

Toric  Piano-Cylinder 

0.12  to  2.00] 

2.25  to  4.00  t+°'"~ 

6.00 

6.75 

7.15 

7.15 

7.15 

Toric  Sphero-Cylinder 

+  O  +  or  -  O  - 

0.12  to  2.00  S 

2.25  to  4.25  S 

0.12  to  2.00  C 

7.50 

8.25 

8.65 

8.65 

8.65 

4.50  to  7.50  S 

0.12  to  2.00  S 

2 .  25  to  4 .  25  S 

2.25  to  4.00  C 

9.00 

9.75 

10.15 

10.15 

10.15 

4.50  to  7.50  S 

0.12  to  2.00  S 

2.25  to  4.25  S 

Over  4.00  C 

10.50 

11.25 

12.00 

12.00 

12.00 

4.50  to  7.50  S 

EXTRA   FOR   PRISMS 

Sphero,  $1.00  per  pair;  CyHnder,  $1.00  per  pair. 

Punktal  are  also  supplied  in  any  of  our  other  regular  colors  at  the  above  prices. 

79 


B     A     U      S     C     II 


L     O     M      B 


OPTICAL 


COM     P    A    N    Y 


KATRAL    LENSES 

PERSONS  successfully  operated  on  for  cataract  may,  in  a  certain  sense, 
become  endowed  with  a  better  power  of  vision  than  one  having  normal 
sight,  due  to  the  fact  that  a  cataract  lens,  in  combination  with  the 
optical  system  of  an  eye  divested  of  its  crystalline  lens,  produces  a  larger 
image  on  the  retina  than  does  the  optical  system  of  a  normal  eye.  This  slight 
advantage,  however,  has  hitherto  been  more  than  offset  by  serious  defects,  in 
that  the  ordinary  (double  convex)  cataract  lenses  supplied  for  such  cases  only 
afforded  a  very  narrow  field  of  view  through  their  centers.  Consequently,  a 
patient  must  constantly  turn  his  head  in  the  desired  direction  or  obtain  badly 
distorted  images. 


Image  Through  Ordinary 
Cataract  Lens 


Image  Through  Katral 
Lens 


The  new  series  of  Katral  lenses  have  removed  this  uncomfortable  handicap 
by  providing  a  field  of  60°  as  well  corrected  throughout  as  that  of  the  Punktal 
lenses  just  described,  permitting  the  patient  to  rotate  his  eyes  naturally  and 
obtain  as  accurate  vision  through  the  margins  as  through  the  centers.  This 
superiority  is  strikingly  shown  by  the  accomjmnying  illustrations. 

To  obtain  these  results  it  is  necessary  to  make  one  of  the  lens  surfaces  non- 
spherical,  a  difficult  process  accounting  largely  for  the  unavoidably  higher 
price.  Katral  lenses  are  also  made  of  a  special  optical  glass,  requiring  careful 
treatment,  but  do  not  differ  noticeably  in  appearance,  size  or  weight  from  a 
meniscus  lens.  They  are  supplied  in  powers  ranging  from  +  8.00  Dyto  +  20.00 
Dy.  As  a  rule  they  are  made  for  a  reading  distance  of  25  cm  (10  inches),  and 
to  restrict  their  weight  are  generally  not  allowed  to  exceed  39  mm  in  diameter. 

To  insure  greatest  satisfaction  to  the  patient,  Katral  lenses  require  very 
accurate  adjustment.  In  cases  of  astigmatism  arising  after  an  operation  none 
but  round  or  drop  oval  lenses  should  be  prescribed;  otherwise  it  would  be 
impossible  to  adapt  them  accurately.  Furthermore,  round  and  drop  oval  lenses 
give  the  patient  quite  an  extension  of  the  lower  portion  of  his  field  of  view. 

To  insure  perfect  satisfaction  complete  data  must  be  given  by  the  refrac- 
tionist.  We  provide  a  printed  form,  shown  on  page  48,  whicli  should  be 
followed  in  full. 


80 


n     A     V      9,     C      n  &  L      O      M      B       /^S@\        OPTICAL  COMPANY 


PRICES   FOR   KATRAL   LENSES 
SPHERO   AND  TORIC   SPHERO-CYLINDER 


(39  mm   ROUND) 


Object  Target 


Image  as  Seen  Through  Lens 


Per  Lens 

Sphere 

8.00  to  15.00  +    

Over  15.00  + 

Toric  Sphero-Cylinder 

+   O    +  1 

8.00  to  15.00  S     ! 

0.50  to  4.00  C      J 

+   O    +  1 

8.00  to  15.00  S     [ 

Over  4.00  C  J 


Uncut 


Per  Lens 

$20.00 
25.00 


20.00 


25.00 


Edged 


Edged  and  Drilled 


2  Holes 


Per  Lens 

$21.00 
26.00 


26.00 


Per  Lens 

$21.50 
26.50 


26.50 


3  Holes 


4  Holes 


Per  Lens 

$22.00 
27.00 


21.00  21.50  22.00 


Per  Lens 

$22.50 
27.50. 


22.50 


27.00  27.50 


81 


LOME 


OPTICAL 


C    O    M     P    A    X    Y 


PRICES   FOR  MISCELLANEOUS    LENSES 

UNCUT 

PORTEX 


Per  Dozen  Pairs 

Stan. 

Rim. 

Per  Dozen  Pairs 

Stan. 

Rim. 

Double 

Double 

Oval  44  X  34  mm 

Round  42  mm 

0.12  to  2.00 

$0.75 

$0.85 

0.12  to  2.00  1 

$0.90 

$1.05 

2 .  25  to  4 .  25 

+ 

.85 

.95 

2 .  25  to  4 .  25 
4 .  50  to  G .  00 

1.00 

1.15 

4.50  to  G.OO 

1.00 

1.10 

1.25 

1.40 

6.50  to  8.00 

1.25 

1.35 

6.50  to  8.00  J 

1.50 

1.65 

Periscopic 

Piano  Flat  White 

Oval  45  X  35.5  mm 

Oval  44  X  34  mm 

.60 

.70 

1.25  Curve 

RouikI  42  mm 

.75 

.85 

0.12  to  2.00) 

.90 

1.00 

2 .  25  to  4 .  25 

+ 

1.00 

1.10 

Piano  Flat  Smoke 

4.50  to  6.00 

1.25 

1.35 

Oval  44  X  34  mm 

.85 

1.05 

6 .  50  to  8 .  00  J 

1.50 

l.GO 

Round  42  mm 

1.10 

1.30 

COQUILLE  AND   MI-COQUILLE   GLASSES 

UNCUT 


II  'ii ^^irr  •;"',rfir'"^ 


Coquille  and  Mi-Coquille  glasses  are  supplied  in  First  Quality  only. 
They  are  blown  and  cut  from  ball. 

If  wanted  with  ground  and  polished  surfaces,  refer  to  prices  of  Piano  1.25  and  G.OO  Curve  on 
pages  54  and  55. 


Per  Dozen  Pairs 


Coquille 

White 

Smoke  and  Blue  .    .    .    . 
Amber 


Mi-Coquille 

White 

Smoke  and  Blue 

Amber 


44  X  33  mm 


$1.00 
1.25 
1.50 

.75 
1.00 
1.25 


50  X  40  mm 


60  X  50  mm 


$1.50 
2.00 
2.50 

1.00 
1.50 
2.00 


$2.00 
2.75 
3.50 

1.50 
2.25 
3.00 


70  X  60  mm 


$3 .  00 
4.00 
5.00 

2.00 
3.00 
4.00 


EXTRA 

Add  25%  to  above  prices  for  Coquille  and  Mi-Coquille  Smoke  and  Blue,  when  ordered  in 
shades  darker  than  D. 


82 


BAUSCII  &  LOMB       /C5!25\        OPTICAL  C    O    M    P    A    N    T 


EDGING   AND   DRILLING 
CENTEX  AND  PORTEX 

IN  the  preceding  pages  we  have  hsted  uncut  lenses  in  the  regular  order 
which  we  have  followed  for  many  years,  hut  attention  is  here  directed  to 
a  departure  from  former  ])ractice  in  the  listing  of  edged  lenses.  Hereto- 
fore it  has  heen  customary  to  list  edged  lenses  at  the  prices  of  finished  lenses. 
In  this  catalog,  however,  we  have  adopted  the  system  of  listing  the  uncut 
lenses  and  the  prices  for  edging  and  drilling  separately. 

The  price  of  a  finished  lens,  white  or  colored  and  of  any  size  or  shape,  can 
readily  be  found,  therefore,  by  taking  the  price  of  the  uncut  in  the  size  required, 
according  to  the  chart  on  page  85,  and  adding  the  separate  prices  for  edging 
and  drilling  and  such  extras  as  may  apply,  noted  on  page  110.  For  lenses  not 
listed  a  special  price  will  be  quoted. 

This  system  is  applied  only  to  our  Centex  and  Portex  series.  For  all  lenses 
listed  by  the  pair,  or  singly,  we  have  found  it  convenient  to  give  both  the  prices 
for  uncut  and  for  edging  and  drilling  in  the  same  section  of  the  catalog,  gener- 
ally on  the  same  page.  These  lenses  include  the  Primex,  Punktal,  Katral, 
Piuphos,  Crookes,  Noviol,  Kryptok  and  Ultex  Onepiece  Bifocals. 


83 


B     A     r      S     C     n  &  L     O     M      R       /tS^l^       OPTICAL  COMPANY 


TABLE  OF  STANDARD  SIZES  OF  EDGED  LENSES 

BEVEL   EDGE 


Eye  Sizes  in  mm 

2 

1 

0 

00 

000 

0005^ 

0000 

Jumbo 

Round 

A 

30.8 

32.4 

33.7 

35.6 

36.8 

38.3 

40.2 

41.5 

Full  Oval 

B 

34x27 

35.5x28.5 

06.8x29.8 

38.7x31.7 

39.8x32.8 

41.5x34.5 

43.5x36.5 

44.9x37.9 

Regular  Oval 

C 

35x26 

36.5x27.5 

37.8x28.8 

39.7x30.7 

41x32 

42.5x33.5 

44.5x35.5 

45.4x37.4 

Long  Oval 

D 

35.5x25.5 

37x27 

38.3x28.3 

40.2x30.2 

41.5x31.5 

43x33 

45x35 

46.9x36.9 

Short  Oval 

E 
G 

33.5x27.5 

35x29 

36.3x30.3 

38.2x32.2 

39.5x33.5 

41x35 

43x37 

44.4x38.4 

German  No.  9 

37x27 

German  No.  11 

38.9x28.9 

German  No.  13 

40.6x30.6 

Australian  No.  2 

35x26 

Australian  No.  3 

36.7x27.7 

Australian  No.  4 

38.4x29.4 

Australian  No.  5 

39.6x30.6 

Australian  No.  lU 

36.7x27.7 

Australian  No.  12 

38.4x29.4 

Clerical  Shape 

H 
I 

34x22.5 

35x20.7 

36x21 

39.5x22.5 

38.5x24.7 

Clerical  Shape 

37x14 

36.4x14.5 

37.7x15.1 

39.5x16 

41x17 

RIMLESS    EDGE 


Eye  Sizes  in  mm 

2 

1 

0 

00 

000 

OOOM 

0000 

Jumbo 

Round 

Ar 

36 

37 

38.5 

40 

41 

42.5 

44.5 

45.4 

Full  Oval 

Br 

36x29 

37x30 

38.5x31.5 

40x33 

41x34 

41.5x34.5 

43.5x36.5 

45.4x38.4 

Regular  Oval 

Cr 

36x27 

37x28 

38.5x29.5 

40x31 

41x32 

42.5x33.5 

44.5x35.5 

45.4x37.4 

Long  Oval 

Dr 

36x26 

37x27 

38.5x28.5 

40x30 

41x31 

44.5x34.5 

45.4x35.4 

Short  Oval 

Er 

34.5x28.5 

35.5x29.5 

37x31 

38.5x32.5 

39.5x33.5      41x35 

43x37 

44.4x38.4 

Drop  Oval 

Fr 

33.7x27.2 

35.2x28.7 

36.5x30 

38.4x31.9 

39.7x33.2  41.2x34.7 

43.2x36.7 

44.1x38.6 

84 


n   A   u    s    c    II 


OPTICAL 


C    O    M     P    A    N    Y 


CHART  OF  UNCUT  SIZES    FOR  EDGING 

This  chart  shows  tlie  sizes  of  Uiiciit  I-ciiscs  to  Ix-  used  Tor  various  si/t-s  of  Vjh^ed  Lenses, 
based  on  the  followinjjf  allowiiiice  I'or  decciilration. 

0.^^  to  ().;57 (iOmm  1..'57  to 'e.OO   .    .    .    .    '■i.OOniin 

0.50to0.87 4.0inni  2. 1^>  to  :$.()()  .    .    .    .    1..5    mm 

l.OOtol.'-'S 2. .'5  mm  3. 'J.'}  up 0.75  mm 

To  find  the  size  of  uncut  lenses  recpiiied  for  a  certain  size  of  edged  lens,  trace  down  the  "width 
of  oval"  colunm,  then  across  to  the  desired  length  of  oval;  the  figure  in  the  intersecting  space 
will  indicate  the  size  of  uncut  that  will  cut  to  the  best  advantage  and  will  form  the  basis  of  prices 
for  lenses  edged  to  size. 


Width  of 

Length  of  Oval  in  mm 

Oval  in  mm 

37.5  38  1  38.5  1  39  39.5  |  40 

40.5  41  1  41.5   42  42.5 

43 

43.5 

47 

44 

47 

44.5 

47 

45 

47 

45.5 

26. 

All  Sizes  Within 
Will  Cut  from 

the  Heavy  Line 
Regular  Oval 

47 

26.5 

47 

47 

47 
47 
47 
47 

47 

47 
47 

47 

47 

27. 

47 

47 
47 
47 

47 

27.5 

47 
47 

47 

28. 

47 

28.5 

47 

47 

47 
47 

47 
47 

47 
47 

47 

29. 

47 

29.5 

47 

47 

47 
47 

47 
47 
47 
47 
47 

47 
47 
47 

47 
47 

47 

30. 

47 

30.5 

47 
47 

47 
47 
47 

47 

31. 

47 

31.5 

47 

47 

32. 

47 
47 

47 
47 

47 

47 

47 
47 

47 
47 

47 
47 

47 

32.5 

47 

33. 

42 

42 

42 

42 

42 

47 

47 

47 

47 

47 
47 
47 

47 

47 
47 

47 
47 
47 
47 
47 
47 
47 

47 

47 
47 
47 

47 
47 
47 

47 

47 
47 
47 
47 
47 
47 
47 
47 
47 
47 
47 
47 

47 
47 
47 
47 
47 
47 
47 
47 
47 
47 
47 
47 
47 

47 

47 
47 
47 
47 
47 
47 
47 
47 
47 
47 
47 
47 

47 

33.5 

42 

42 

42 

42 

47 
47 
47 
47 
47 

47 
47 
47 
47 
47 

47 

47 
47 
47 
47 

47 
47 
47 
47 
47 

47 

34. 

42 

42 

42 

42 
42 
42 

47 

34.5 

42 

47 

35. 

47 

35.5 

47 

36. 

42 

47 

47 

47 

47 

47 

47 

36.5 

42 

47 
47 
47 

47 
47 
47 

47 
47 

47 
47 
47 

47 
47 

47 
47 
47 
47 

47 

47 
47 
47 
47 
47 

47 
47 
47 

47 

47 

47 

47 
47 
47 
47 

47 

37. 

42 

42 

47 

37.5 

47 

38. 

42 

47 

47 

38.5 

42 

47 

47 

39. 

47 

85 


AMERICAN    STANDARD- BEVEL  EDGE 


m 


AMERICAN,  STANDARD-BEVEL    eogp 


87 


AMERICAN     STANDARD-  RIMLESS   EOC5E 


SHORT  OVAL. 


44.4  X  38.4  mm 


ER      ^^m 

ER     '"'^m 

ER           -1 

43x37mm    ^^1 

'  41  x35  mm    ^H 

39.5x33.6  mni 

OOOO     JIH 

OO0'/2     J^V 

ooo 

88 


AMERICAN     STANDARD  -  RIMLESS   EDGE 


89 


AMERICAN     SlANDARD-    rimless    EDGE  -  DROP  ova  l 


90 


AMERICAN       STANDARD        SPECIAL    shapbs 


91 


n    A    u    s    c    n 


L     o     M     B 


O     P    T    I     f     A     L 


O    M     PAN    Y 


PRICES  FOR   BEVEL  AND   RIMLESS  EDGING 

PLANO   AND   SPHERO 

ROUND 

(TO  BE  ADDED  TO  UNCUT  LENSES) 

To  obtain  prices  of  finished  lenses,  add  prices  given  below  to  price  of  uncut,  taking  into  account 
the  size  of  uncut  required  per  chart  on  page  85,  and  such  extra  as  may  apply,  given  on  page  110. 

To  determine  price  for  size  of  eye,  other  than  standard,  figure  25  cents  per  dozen  pairs  extra 
to  the  nearest  standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  ])age  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


Per  Dozen  Pairs 


Piano 


Flat 

1 .25  Curve 
6 .  00  Curve 
9.00  Curve 


Sphero 

2.001 
4.25 
6.00 
8.00 


0.12  to 

2.25  to 

4 .  50  to 

6 .  50  to 

8.50  to  10.00  i 
10.. 50  to  i;}.00  j 
14.00  to  Ki.OO 
18 .  00  to  20 .  00  J 


0.12  to    2.00 

2 .  25  to    4 .  25 

4 .  50  to    6 .  00 

6 .  50  to    8 .  00 

8.50  to  10.00 

10.50  to  13.00 

14.00  to  16.00 

18 .  00  to  20 .  00 


Piano, 
Double  and 

Periscojjic 

+ 


Piano, 

Double  and 

Periscopic 


Meniscus 

6.00  Base  Curve 


0.12  to  2.00 
2 .  25  to  4 .  25 
4 .  50  to  6 . 00 
6 .  50  to  8 .  00 


Meniscus 
^   6.00  Base  Curve 
0.12  to  2.00  1 
2 . 25  to  4 . 25  [  _ 
4 .  50  to  6 .  00  I 
6.50  to  8.00  J 


WHITE 


$0.70 

.70 

1.50 

2.30 


.70 

.75 

.80 

.85 

1.80 

2.30 

2.80 

2.80 


.70 

.75 

.80 

.85 

2.30 

3.30 

4.30 

4.30 


1.50 
1.60 
1.70 
1.80 


$0.80 

.80 

1.80 

2.60 


.95 
2.50 
3.50 
4.50 
4.50 


1.10  1.30 

1.20  1.40 

1.30  I     1.50 

1.40  1.60 


1.80 
1.90 
2.00 
2.10 


00 


.80 

.85 

.90 

.95 

2 

.00 

2 

.50 

3 

.00 

3 

.00 

.80 

.85 

.90 

$1.00 
1.00 
2.30 
3.10 


1.00 
1.05 
1.10 
1.15 
2.30 
2.80 
3.30 
3  30 


1.00 
1.05 
1.10 
1.15 
2.80 
3.80 
4.80 
4.80 


1.80 
1.90 
2.00 
2.10 


2.30 
2.40 
2.50 
2.60 


000 


^1.30 
1.30 
2.80 
3.60 


1.30 
1.35 
1.40 
1.45 
2.80 
3.30 
3.80 
3.80 


1.30 
1.35 
1.40 
1.45 
3.30 
4.30 
5.30 
5.30 


2.30 
2.40 
2.50 
2.60 


2.80 
2.90 
3.00 
3.10 


OOOi 


151.80 
1.80 
3.30 
4.10 


1.80 
1.85 
1.90 
1.95 


1.80 
1.85 
1.90 
1.95 


2.80 
2.90 
3.00 
3.10 


3.30 
3.40 
3.50 
3.60 


0000 


$1.80 
1.80 
3.30 
4.10 


1.80 
1.85 
1.90 
1.95 


1.80 
1.85 
1.90 
1.95 


2.80 
2.90 
3.00 
3.10 


3.30 
3.40 
3.50 
3.60 


Jumbo 


$2.30 
2.30 
3.80 
4.60 


2.30 
2.35 
2.40 
2.45 


2.30 
2.35 
2.40 
2.45 


3.30 
3.40 
3.50 
3.60 


3.80 
3.90 
4.00 
4.10 


R     A     U      S     C      II 


L      O      M      1! 


n     V    T    I     ('    \     L 


()    .M     I'    .\     .\    V 


PRICES  FOR  BEVEL  AND  RIMLESS   EDGING 

PLANO   AND   SPHERO 

ROUND 

(TO   BE   ADDED  TO   UNCUT   LENSES) 

To  obtain  prices  of  fini.shed  len.ses,  add  jmccs  f^ivcn  l)el()w  to  lu-icc  of  uncut,  t.ikin^j  into  account 
the  size  of  uncut  reijuired  per  cliart  on  page  85,  and  such  extra  as  nuiy  a])ply,  <,u\en  on  paji;e  1 10. 

To  determine  price  for  size  of  eye,  other  than  standard,  figure  25  cents  per  dozen  pairs 
extra  to  tiie  nearest  stanchird  eye  size. 

For  the  required  luicut  size,  consult  cliart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


Per  Dozen  Pairs 

COLORED 

" 

1 

0 

00 

000 

OOOi 

0000 

Jumbo 

Piano 

Flat 

1.25  Curve 
6 .  00  Curve 
9.00  Curve 

$0.80 

.80 

1.80 

2.80 

$0.90 

.90 

2.10 

3.10 

$1.20 
1.20 
2.80 
4.10 

$1.50 
1.50 
3.30 
4.60 

$2.00 
2.00 
3.80 
5.10 

$2.00 
2.00 
3.80 
5.10 

$2.50 
2.50 
4.30 
5.60 

Sphere 

0.12  to    2.00  1       Piano, 
2 .  25  to    4 .  25     Double  and 
4 .  50  to    6 .  00      Pcriscopic 
6 .  50  to    8 .  00  J           + 

.80 
.85 
.90 
.95 

.90 

.95 

1.00 

1.05 

1.20 
1.25 
1.30 
1.35 

1.50 
1.55 
1.60 
1.65 

2.00 
2.05 
2.10 
2.15 

2.00 
2.05 
2.10 
2.15 

2.50 
2.55 
2.60 
2.65 

0.12  to    2.00  1       Piano, 
2.25  to    4.25  [  Doul)le  and 
4.50  to    6.00      Periscopic 
6.50  to    8.00  J 

.80 
.85 
.90 
.95 

.90 

.95 

1.00 

1.05 

1.20 
1.25 
1.30 
1.35 

1.50 
1.55 
1.60 
1.65 

2.00 
2.05 
2.10 
2.15 

2.00 
2.05 
2.10 
2.15 

2.50 
2.55 
2.60 
2.65 

Meniscus 

6.00  Base  Curve 

0.12  to  2.00  1 
2 .  25  to  4 . 25 
4.50  to  6.00     ^ 
6.50  to  8.00  J 

1.30 
1.40 
1.50 
1.60 

1.50 
1.60 
1.70 
1.80 

2.20 
2.30 
2.40 
2.50 

2.70 
2.80 
2.90 
3.00 

3.20 
3.30 
3.40 
3.50 

3.20 
3.30 
3.40 
3.50 

3.70 
3.80 
3.90 
4.00 

Meniscus 

+  6.00  Base  Curve 

0.12  to  2.00 
2 .  25  to  4 .  25 
4 .  50  to  6 .  00  j 
6.50  to  8.00  J 

1.80 
1.90 
2.00 
2.10 

2.10 
2.20 
2.30 
2.40 

2.80 
2.90 
3.00 
'3.10 

3.30 
3.40 
3.50 
3.60 

3.80 
3.90 
4.00 
4.10 

3.80 
3.90 
4.00 
4.10 

4.30 
4.40 
4.50 
4.60 

93 


B     A     U      S      C      11 


L     f)     M      D 


OPTICAL 


C    O    M     P    A    N    Y 


PRICES  FOR  BEVEL  AND  RIMLESS  EDGING 

PLANO   AND   SPHERO 

REGULAR  OVAL 

(TO   BE  ADDED   TO  UNCUT  LENSES) 

To  obtain  prices  of  finished  lenses,  add  prices  given  below  to  price  of  uncut,  taking;  into  account 
the  size  of  uncut  required  per  chart  on  page  8.5,  and  such  extra  as  may  apply,  given  on  page  110. 

To  determine  price  for  size  or  shape  of  eye,  other  than  standard,  add  length  to  width  and 
figure  25  cents  jicr  dozen  ]iairs  extra  to  the  nearest  standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  ])age  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


WHITE 

rcr  L/Oicn  x^dirs 

1 

0 

00 

000 

000  ^< 

0000 

Jumbo 

Piano 

Flat 

$0.40 

$0.50 

$0.70 

$1.00 

$1.50 

$1.50 

$2.00 

1 .  25  Curve 

.40 

.50 

.70 

1.00 

1.50 

1.50 

2.00 

6.00  Curve 

1.20 

1.50 

2.00 

2.50 

3.00 

3.00 

3.50 

9.00  Curve 

2.00 

2.30 

2.80 

3.30 

3.80 

3.80 

4.30 

Sphero 

0.12  to    2.00 

.40 

.50 

.70 

1.00 

1.50 

1.50 

2.00 

2.25  to    4.25 

.45 

.55 

.75 

1.05 

1.55 

1.55 

2.05 

4.50  to    6  00 

Piano, 

.50 

.60 

.80 

1.10 

1.60 

1.60 

2.10 

6 .  50  to    8 .  00 

l)oul)li'  and 

.55 

.65 

.85 

1.15 

1.65 

1.65 

2.15 

8. 50  to  10.00 

Pcrisco|)ic 

1.50 

1.70 

2.00 

2.50 

10. 50  to  l.'J.OO 

+ 

2.00 

2.20 

2.50 

3.00 

14.00  to  16.00 

2.50 

2.70 

3.00 

3.50 

18.00  to  20.00 

2.50 

2.70 

3.00 

3.50 

0.12  to    2.00 

.40 

.50 

.70 

1.00 

1.50 

1.50 

2.00 

2.25  to    4.25 

.45 

.55 

.75 

1.05 

1.55 

1.55 

2.05 

4 .  50  to    6 .  00 

Piano, 

.50 

.60 

.80 

1.10 

1.60 

1.60 

2.10 

6 .  50  to    8 .  00 

Double  and 

.55 

.65 

.85 

1.15 

1.65 

1.65 

2.15 

8.50  to  10.00 

Periscopic 

2.00 

2.20 

2.50 

3.00 

10.50  to  13.00 

— 

3.00 

3.20 

3.50 

4.00 

14.00  to  16.00 

4.00 

4.20 

4.50 

5.00 

18.00  to  20.00 

4.00 

4.20 

4.50 

5.00 

Meniscus 

—  5.00  Base  Curve 

0.12  to  2.00  1 

.80 

1.00 

1.50 

2.00 

2.50 

2.50 

3.00 

2 .  25  to  4 .  25  1 
4.50  to  6.00     '^ 

.90 

1.10 

1.60 

2.10 

2.60 

2.60 

3.10 

1.00 

1.20 

1.70 

2 .  20 

2.70 

2.70 

3.20 

6.50  to  8.00  1 

1.10 

1.30 

1.80 

2.30 

2.80 

2.80 

3.30 

Meniscus 

+  6.00  Base  Curve 

0.12  to  2.00  1 

1.20 

1.50 

2.00 

2.50 

3.00 

3.00 

3.50 

2.25  to  4.25  1 

1.30 

1.60 

2.10 

2.60 

3.10 

3.10 

3.60 

4.50  to  6,00 

1.40 

1.70 

2.20 

2.70 

3.20 

3.20 

3.70 

() .  50  to  8 .  00  ] 

1 .  50 

1.80 

2.30 

2.80 

3.30 

3.30 

3.80 

Coquille 

.30 

.30 

.30 

.50 

1.00 

1.00 

1.50 

Mi-Coquille 

.20 

.20 

.30 

.50 

1.00 

1.00 

1.50 

94 


B     A     f     S     C     II 


L     O     M     n 


OPTICAL 


C    O    M     ]■    A    N    Y 


PRICES   FOR   BEVEL  AND   RIMLESS   EDGING 

PLANO   AND   SPHERO 

REGULAR  OVAL 

(TO  BE  ADDED  TO  UNCUT  LENSES) 

To  obtain  price.s  of  fini.shed  len.se.s,  add  price-s  fi;ivon  lielow  to  price  of  uncut,  takirifj  into  account 
the  size  of  uncut  required  per  diart  on  page  85,  and  .such  extra  a.s  may  aj)ply,  n;iveu  on  paf^e  1 10. 

To  determine  price  for  size  or  shai)e  of  eye,  otiier  tiian  standard,  add  lenj,'tli  to  widtli  and 
figure  25  cents  per  tlozen  pairs  extra  to  the  nearest  standard  eye  size. 

For  tlie  required  imcut  size,  consult  chart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


COLORED 

1 

0 

00 

000 

mV2 

0000 

Jumbo 

Piano 

Flat 

1 .  25  Curve 
6 .  00  Curve 
9.00  Curve 

$0.50 

.50 

1.50 

2.50 

$0.60 

.60 

1.80 

2.80 

$0.90 

.90 

2.50 

3.80 

$1.20 
1.20 
3.00 
4.30 

$1.70 
1.70 
3.50 
4.80 

$1.70 
1.70 
3.50 
4.80 

$2.20 
2.20 
4.00 
5.30 

Sphero 

0.12  to    2.00  1        Piano, 
2 .  25  to    4 .  25  [  Doulile  and 
4.50  to    6.00      Periscopic 
6.50  to    8.00             + 

.50 
.55 
.60 
.65 

.60 
.65 
.70 
.75 

.90 

.95 

1.00 

1.05 

1.20 
1.25 
1.30 
1.35 

1.70 
1.75 
1.80 
1.85 

1.70 
1.75 
1.80 
1.85 

2.20 
2.25 
2.30 
2.35 

0.12  to    2.00]       Piano, 
2 .  25  to    4 .  25     Douljle  and 
4.50  to    6.00      Periscopic 
6.50  to    8.00  J           - 

.50 
.55 
.60 
.65 

.60 
.65 
.70 
.75 

.90 

.95 

1.00 

1.05 

1.20 
1.25 
1.30 
1.35 

1.70 
1.75 
1.80 
1.85 

1.70 
1.75 
1.80 
1.85 

2.20 
2.25 
2.30 
2.35 

Meniscus 

—  6.00  Base  Curve 

0.12  to  2.00 
2.25  to  4.25 
4.50  to  6.00     "^ 
6.50  to  8.00 

1.00 
1.10 
1.20 
1.30 

1.20 
1.30 
1.40 
1.50 

1.90 
2.00 
2.10 
2.20 

2.40 
2.50 
2.60 
2.70 

2.90 
3.00 
3.10 
3.20 

2.90 
3.00 
3.10 
3.20 

3.40 
3.50 
3.60 
3.70 

Meniscus 

+  6.00  Base  Curve 

0.12  to  2.00  1 
2 .  25  to  4 .  25 
4.50  to  6.00 
6 .  50  to  8 .  00 

1.50 
1.60 
1.70 
1.80 

1.80 
1.90 
2.00 
2.10 

2.50 
2.60 

2.70 
2.80 

3.00 
3.10 
3.20 
3.30 

3.50 
3.60 
3.70 
3.80 

3.50 
3.60 
3.70 
3.80 

4.00 
4.10 
4.20 
4.30 

Coquille 
Mi-Coquille 

.30 
.20 

.30 
.20 

.30 
.30 

.50 
.50 

1.00 
1.00 

1.00 
1.00 

1.50 
1.50 

95 


B     A     U      S     C     II 


LOME 


OPTICAL 


C    O    M     P    A    X    Y 


PRICES  FOR  BEVEL  AND   RIMLESS  EDGING 
PLANO   AND   SPHERO 
FULL  AND    SHORT   OVAL 

(TO  BE  ADDED  TO  UNCUT  LENSES) 

To  obtain  prices  of  finished  lenses,  add  prices  given  below  to  price  of  uncut,  taking  into  account 
the  size  of  uncut  required  per  chart  on  page  85,  and  such  extra  as  may  a|)ply,  given  on  page  110. 

To  determine  price  for  size  or  shape  of  eye,  other  than  standard,  add  length  to  width  and 
figure  25  cents  per  dozen  pairs  extra  to  the  nearest  standard  eye  size. 

For  the  requirefl  uncut  size,  consult  chart  on  page  85. 

Prices  for  Judging  not  listed,  will  be  given  on  recjuest. 


WHITE 

Per  Dozen  Pairs 

1 

0 

00 

000 

000^ 

0000 

Jumbo 

Piano 

Flat 

$0.65 

$0.75 

$0.95 

$1.25 

$1.75 

$1.75 

$2.25 

1.25  Curve 

.65 

.75 

.95 

1.25 

1.75 

1.75 

2.25 

6.00  Curve 

1.45 

1.75 

2.25 

2.75 

3.25 

3.25 

3.75 

9.00  Curve 

2.25 

2.55 

3.05 

3.55 

4.05 

4.05 

4.55 

Sphero 

0.12  to    2.00  1 

.65 

.75 

.95 

1.25 

1.75 

1.75 

2.25 

2.25  to    4.25 

.70 

.80 

1.00 

1.30 

1.80 

1.80 

2.30 

4 .  50  to    G .  00 

Piano, 

.75 

.85 

1.05 

1.35 

1.85 

1.85 

2.35 

6.50  to    8.00 

Double  and 

.80 

.90 

1.10 

1.40 

1.90 

1.90 

2.40 

8.50  to  10.00 

Periscopic 

1.75 

1.95 

2.25 

2.75 

10.50  to  13.00 

+ 

2.25 

2.45 

2.75 

3.25 

14.00  to  10.00 

2.75 

2.95 

3.25 

3.75 

18.00  to  20.00 

2.75 

2.95 

3.25 

3.75 

0.12  to    2.00  1 

.65 

.75 

.95 

1.25 

1.75 

1.75 

2.25 

2.25  to    4.25 

.70 

.80 

1.00 

1.30 

1.80 

1.80 

2.30 

4.50  to    6.00 

Piano, 

.75 

.85 

1.05 

1.35 

1.85 

1.85 

2.35 

6.50  to    8.00 

Double  and 

.80 

.90 

1.10 

1.40 

1.90 

1.90 

2.40 

8.50  to  10.00 

Periscopic 

2.25 

2.45 

2.75 

3.25 

10.50  to  13.00 

3.25 

3.45 

3.75 

4.25 

14.00  to  16.00 

4.25 

4.45 

4.75 

5.25 

18.00  to  20.00 

4.25 

4.45 

4.75 

5 .  25 

Meniscus 

—  6  00  Base  Curve 

0.12  to  2.00  1 

1.05 

1.25 

1.75 

2.25 

2.75 

2.75 

3.25 

2 .  25  to  4 . 25  [    , 
4 .  50  to  6 .  00 

1.15 

1.35 

1.85 

2.35 

2.85 

2.85 

3.35 

1.25 

1.45 

1.95 

2.45 

2.95 

2.95 

3.45 

6.50  to  8.00  1 

1.35 

1.55 

2.05 

2.55 

3.05 

3.05 

3.55 

Meniscus 

+  6.00  Base  Curve 

0.12  to  2.00 

1.45 

1.75 

2.25 

2.75 

3.25 

3.25 

3.75 

2.25  to  4.25 

1.55 

1.85 

2.35 

2.85 

3.35 

3.35 

3.85 

4 .  50  to  6 .  00 

1.65 

1.95 

2.45 

2.95 

3.45 

3.45 

3.95 

6.50  to  8.00  . 

1.75 

2.05 

2.55 

3.05 

3.55 

3.55 

4.05 

96 


C     A     U      S     C      H 


L     O     M      13 


O     I'    T    1     r    A    L 


('    O    M     1'    .\    N    V 


PRICES  FOR   BEVEL  AND  RIMLESS   EDGING 
PLANO   AND   SPHERO 
FULL  AND   SHORT  OVAL 

(TO   BE   ADDED   TO   UNCUT   LENSES) 

To  obtain  price.?  of  fini.slied  len.se.s,  add  prices  given  below  to  price  of  imcut,  taking  into  account 
the  size  of  uncut  ret(uire(l  per  chart  on  page  85,  and  such  extra  as  may  apply,  given  on  |)agc  1 10. 

To  determine  price  for  size  or  shape  of  eye,  other  than  standard,  iidd  lengtli  to  width  and 
6gure  25  cents  per  dozen  pairs  extra  to  the  nearest  stanrlard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


Per  Dozen  Pairs 

COLORED 

1 

0 

00 

000 

000^ 

0000 

Jumbo 

Piano 

Flat 

1 .  25  Curve 
6 .  00  Curve 
9.00  Curve 

$0.75 

.75 

1.75 

2.75 

$0.85 

.85 

2.05 

3.05 

$1.15 
1.15 
2.75 
4.05 

$1.45 
1.45 
3.25 
4.55 

$1.95 
1.95 
3.75 
5.05 

$1.95 
1.95 
3.75 
5.05 

$2.45 
2.45 
4.25 
5.55 

Sphere 

0.12  to    2.00]       Piano, 
2.25  to    4.25  1  Double  and 
4.50  to    6.00      Periscopic 
6.50  to    8.00             + 

.75 
.80 
.85 
.90 

.85 

.90 

.95 

1.00 

1.15 
1.20 
1.25 
1.30 

1.45 
1.50 
1.55 
1.60 

1.95 
2.00 
2.05 
2.10 

1.95 

2.00 
2.05 
2.10 

2.45 
2.50 
2.55 
2.60 

0.12  to    2.00]        Piano, 
2 .  25  to    4 .  25  [  Double  and 
4.50  to    6.00  1    Periscopic 
6.50  to    8.00  J           - 

.75 
.80 
.85 
.90 

.85 

.90 

.95 

1.00 

1.15 
1.20 
1.25 
1.30 

1.45 
1,50 
1.55 
1.60 

1.95 
2 .  00 
2.05 
2.10 

1.95 
2.00 
2.05 
2.10 

2.45 
2.50 
2.55 
2.60 

Meniscus 

—  6.00  Base  Curve 

0.12  to  2.00 
2.25  to  4.25  [    , 
4.50  to  6.00 
6.50  to  8.00 

1.25 
1.35 
1.45 
1.55 

1.45 
1.55 
1.65 
1.75 

2.15 
2.25 
2.35 
2.45 

2.05 
2.75 
2.85 
2.95 

3.15 
3.25 
3.35 
3.45 

3.15 
3.25 
3.35 
3.45 

3.05 
3.75 
3.85 
3.95 

Meniscus 

' 

+  6.00  Base  Curve 

0.12  to  2.00] 
2 .  25  to  4 .  25  1 
4 .  50  to  6 .  00 
6.50  to  8.00 

1.75 
1.85 
1.95 
2.05 

2.05 
2.15 

2.25 
2.35 

2.75 
2.85 
2.95 
3.05 

3.25 
3.35 
3.45 
3.55 

3.75 
3.85 
3.95 
4.05 

3.75 
3.85 
3.95 
4.05 

4.25 
4.35 
4.45 
4.55 

97 


A     V      S     C      II 


L     O     MB 


OPTICAL 


C    O    M     P    A    N    Y 


PRICES  FOR   BEVEL  AND  RIMLESS  EDGING 
PLANO   AND   SPHERO 
DROP  OVAL 

(TO  BE  ADDED  TO  UNCUT   LENSES) 

To  obtain  prices  of  finished  lenses,  add  prices  f^iven  l)elow  to  price  of  uncnt,  taking  into  account 
the  size  of  uncut  rerjuired  per  chart  on  page  8.5,  and  such  extra  as  may  apjily,  given  on  page  110. 

To  tieterniine  price  for  size  or  shape  of  eye,  other  than  standard,  add  length  to  width  and 
figure  2.>  cents  per  dozen  pairs  extra  to  the  nearest  standard  eye  size. 

For  the  requirefl  uncut  size,  consult  chart  on  jmge  85. 

Prices  for  Edging  not  listed,  will  he  given  on  reciuest. 


WHITE 

Per  Dozen  Pairs 

1 

0 

00 

000 

000>^ 

0000 

Jumbo 

Piano 

Flat 

$0.90 

$1.00 

$1.20 

$1.50 

$2.00 

$2.00 

$2.50 

1.2.5  Curve 

.90 

1.00 

1.20 

1.50 

2.00 

2.00 

2.50 

6.00  Curve 

1.70 

2.00 

2.50 

3.00 

3.50 

3.50 

4.00 

9.00  Curve 

2.50 

2.80 

3.30 

3.80 

4.30 

4.30 

4.80 

Sphere 

0.12  to    2.00 

.90 

1.00 

1.20 

1.50 

2.00 

2.00 

2., 50 

2.2.5  to    4.25 

.95 

1.05 

1.25 

1.55 

2.05 

2.05 

2.55 

4.50  to    GOO 

Piano, 

1.00 

1.10 

1.30 

1.60 

2.10 

2.10 

2 .  CO 

6 .  50  to    8 .  00 

Doulile  and 

1.05 

1 .  15 

1.35 

1.65 

2.15 

2.15 

2  G5 

8.. 50  to  10.00 

Periscopic 

2.00 

2 .  20 

2.50 

3.00 

10. 50  to  1.3.00 

+ 

2 .  50 

2 .  71) 

3 .  00 

3.50 

14.00  to  IG.OO 

3.00 

3 .  20 

3.50 

4.00 

18 .  00  to  20 .  00 

3.00 

3.20 

3.50 

4.00 

0.12  to    2.00 

.90 

1.00 

1.20 

1.50 

2.00 

2.00 

2.50 

2 .  25  to    4 .  25 

.95 

1.05 

1.25 

1..55 

2.05 

2.05 

2.55 

4 .  50  to    G  .  00 

Piano, 

1.00 

1.10 

1.30 

1.60 

2.10 

-  2.10 

2.60 

G .  50  to    8 .  00 

Double  and 

1.05 

1.15 

1.35 

1.65 

2.15 

2.15 

2.65 

8. 50  to  10.00 

Periscopic 

2.50 

2.70 

3 .  00 

3.. 50 

10.50  to  i;5.oo 

— 

3 .  50 

3 .  70 

4 .  00 

4. 50 

14.00  to  IG.OO 

4.. 50 

4.70 

5 .  00 

5.50 

18.00  to  20.00  . 

4.50 

4.70 

5.00 

5.50 

Meniscus 

—  6.00  Base  Curve 

0.12  to  2.00  ! 

1.30 

1.50 

2.00 

2.50 

3.00 

3.00 

3.50 

2 .  25  to  4 .  25  [ 
4.50  to  GOO     + 

1.40 

1.60 

2.10 

2.60 

3.10 

3.10 

3.60 

1.50 

1.70 

2.20 

2.70 

3.20 

3.20 

3.70 

6.50  to  8.00  J 

1.60 

1.80 

2.30 

2.80 

3.30 

3.30 

3.80 

Meniscus 

+  6.00  Rase  Curve 

0.12  to  2.00  j 

1.70 

2.00 

2.50 

3.00 

3. 50 

3.50 

4.00 

2.25  to  4.25  1 

1.80 

2.10 

2.60 

3.10 

3.60 

3.60 

4.10 

4 .  50  to  6 .  00  1 

1.90 

2.20 

2.70 

3.20 

3.70 

3.70 

4.20 

6.50  to  8.00  J 

2.00 

2.30 

2.80 

3.30 

3.80 

3.80 

4.30 

r-8 


L    o    M    n 


OPTICAL 


COM    P   A    N    V 


PRICES   FOR   BEVEL   AND   RIMLESS   EDGING 

PLANO   AND   SPHERO 

DROP  OVAL 

(TO   BE  ADDED  TO   UNCUT   LENSES) 

To  obtain  prices  of  finislicd  lenses,  add  prices  given  helow  to  price  of  uncut,  taking  into  account 
the  .size  of  uncut  required  per  cliart  on  page  85,  and  .such  extra  as  may  a])ply,  given  on  page  110. 

To  determine  price  for  size  or  sliape  of  eye,  other  than  .standard,  ,idd  Icngtli  to  width  and 
figure  25  cents  per  dozen  extra  to  the  nearest  .standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  page  85. 

Prices  for  fxlging  not  listed,  will  l)e  given  on  request. 


Per  Dozen  Pairs 

COLORED 

1 

0 

00 

000 

my2 

0000 

Jumbo 

Piano 

Flat 

1 .  25  Curve 
6.00  Curve 
9.00  Curve 

$1.00 
1.00 
2.00 
3.00 

$1.10 
1.10 
2.30 
3.30 

$1.40 
1.40 
3.00 
4.30 

$1.70 
1.70 
3.50 
4.80 

$2.20 
2.20 
4.00 
5.30 

$2.20 
2.20 
4.00 
5.30 

$2.70 
2.70 
4.50 
5.80 

Sphero 

0.12  to    2.00  1       Piano, 
2 .  25  to    4 .  25     Double  and 
4 .  50  to    6 .  00      Periscopic 
6 .  50  to    8 .  00  J           + 

1.00 
1.05 
1.10 
1.15 

1.10 
1.15 
1.20 
1.25 

1.40 
1.45 
1.50 
1.55 

1.70 
1.75 
1.80 
1.85 

2.20 
2.25 
2.30 
2.35 

2.20 
2.25 
2.30 
2.35 

2.70 
2.75 
2.80 
2.85 

0.12  to    2.00  1       Piano, 
2 .  25  to    4 .  25     Double  and 
4.50  to    6.00  I    Periscopic 
6 . 50  to    8 . 00  J           - 

1.00 
1.05 
1.10 
1.15 

1.10 
1.15 
1.20 
1.25 

1.40 
1.45 
1.50 
1.55 

1.70 
1.75 
1.80 
1.85 

2.20 
2.25 
2.30 
2.35 

2.20 
2.25 
2.30 
2.35 

2.70 
2.75 
2.80 
2.85 

Meniscus 

—  6.00  Base  Curve 
0.12  to  2.00  1 
2 .  25  to  4 .  25  I 
4 .  50  to  6 .  00      "^ 
6 .  50  to  8 .  00  ) 

1.50 
1,60 
1.70 
1.80 

1.70 

1 .  80 
1.90 

2 .  00 

2.40 
2.50 
2.60 
2 .  70 

2.90 
3.00 
3.10 
3.20 

3.40 
3.50 
3.60 
3.70 

3.40 
3.50 
3.60 
3.70 

3.90 
4.00 
4.10 
4.20 

Meniscus 

+  6.00  Base  Curve 

0.12  to  2.00  ] 
2 .  25  to  4 .  25 
4 .  50  to  6 .  00 
6.50  to  8.00  J 

2.00 
2.10 
2.20 
2.30 

2.30 
2.40 
2.50 
2.60 

3.00 
3.10 
3.20 
3.30 

3.50 
3.60 
3.70 
3.80 

4.00 
4.10 
4.20 
4.30 

4.00 
4.10 
4.20 
4.30 

4.50 
4.60 
4.70 
4.80 

99 


B    A    U     S     C     H 


LOME 


OPTICAL 


COM     P   A    N    Y 


PRICES   FOR   BEVEL   AND  RIMLESS  EDGING 

CYLINDER,  FLAT   AND   TORIC 

ROUND 

(TO  BE  ADDED  TO  UNCUT  LENSES) 

To  obtain  prices  of  finished  lenses,  add  prices  given  below  to  price  of  uncut,  taking  into  account 
the  size  of  uncut  required  per  chart  on  page  85,  and  such  extra  as  may  apply,  given  on  page  110. 

To  determine  price  for  size  of  eye,  other  than  standard,  figure  25  cents  per  dozen  pairs 
extra  to  the  nearest  standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  page  85. 

Prices  for  P^dging  not  listed,  will  be  given  on  request. 


WHITE 

Per  Dozen  Pairs 

1 

0 

00 

000 

000^ 

0000 

Jumbo 

Plano-Cylinder 

Flat 

0.12  to  2.00  1        , 
2.25  to  4.25  i       Yxes 

4.50  to  6.00       q,,o   „:,_|    tor,o 

6.50  to  8.00  J  -^'^    ''"''  ^^" 

$1.30 
1.40 

$1 .  50 
1.60 

$1.80 
1.90 

$2.30 
2.40 

$2.80 
2.90 

$2.80 
2.90 

$3.30 
3.40 

1.50 

1.70 

2.00 

2.50 

3.00 

3.00 

3.50 

1.60 

1.80 

2.10 

2.60 

3.10 

3.10 

3.60 

0.12  to  2.00 

1.50 

1.70 

2.00 

2.50 

3.00 

3.00 

3.50 

2 .  25  to  4 .  25  i      +  or  - 

1.60 

1.80 

2.10 

2.60 

3.10 

3.10 

3.60 

4 .  50  to  6 .  00     Other  Axes 

1.70 

1.90 

2.20 

2.70 

3.20 

3.20 

3.70 

6.50  to  8.00 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

Sphero-Cylinder 

Flat 

0.12  to  2.00       +0+,-0-, 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

2 .  25  to  4 .  25      +  O  -  or  -  O  + 

1.90 

2.10 

2.40 

2.90 

3.40 

3.40 

3.90 

4.50  to  6.00                  Axes 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

6.50  to  8.00          90°  and  180° 

2.10 

2.30 

2.60 

3.10 

3.60 

3.60 

4.10 

0.12  to  2.00  1      ,    ^    ,          ^ 
2.25  to  4.25!]".^"^'       ^_r 
4.50to6.00     +-^,^',     7  + 
6.50  to  8.00  1         <Jthei  Axes 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

2.10 

2.30 

2.60 

3.10 

3.60 

3.60 

4.10 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

Plano-Cylinder 

Toric 

0.12  to  2. 00 
2.25  to  4.25           +°^" 
4.50  to  6.00     „,,o        r^ono 
6.50  to  8.00  J  '^^'    ""''^^*' 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

1.90 

2.10 

2 .  40 

2 .  90 

3.40 

3.40 

3.90 

2.00 
2.10 

2 .  20 
2.30 

2.50 
2.60 

3.00 
3.10 

3.50 
3.60 

3.50 
3.60 

4.00 
4.10 

0.12  to  2.00 

2.00 

2 .  20 

2.50 

3.00 

3.50 

3.50 

4.00 

2 .  25  to  4 .  25         +  or  - 

2.10 

2 .  30 

2.60 

3.10 

3.60 

3 .  60 

4.10 

4 .  50  to  6 .  00  1  Other  Axes 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

0 .  50  to  8 . 00  J 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

Sphero-Cylinder 

Toric 

0.12  to  2.00  1    +0+,-0-, 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

2.25  to  4.25  1   +  0  -  or  -  0  + 

1.90 

2.10 

2.40 

2.90 

3.40 

3.40 

3.90 

4.50  to  6.00  1               Axes 

2.00 

2.20 

2.50 

3.00 

3.50 

3,50 

4.00 

6.50  to  8.00  1        90°  and  180° 

2.10 

2.30 

2.60 

3.10 

3.60 

3.60 

4.10 

0.12  to  2.00  j      ,    ^    ,          ^ 
2.25  to  4.25  1  ^;r  ^'       ^     ' 

4.50  to  6.00     +7)therAxer 
6.50  to  8.00  J         «Jtner  Axes 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

2.10 
2.20 

2.30 
2.40 

2.60 
2.70 

3.10 
3.20 

3.60 
3.70 

3.60 
3.70 

4.10 
4.20 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

100 


B     A     U      S     C      H 


L     O     M     B 


OPTICAL 


C    O    M     P    A    X    Y 


PRICES   FOR   BEVEL   AND   RIMLESS  EDGING 

CYLINDER,  FLAT   AND  TORIC 

ROUND 

(TO   BE  ADDED  TO   UNCUT   LENSES) 

To  obtain  prioe.s  of  fini.shed  Icii.se.s,  add  prices  fjiveii  l)cl()\v  to  price  of  uncut,  taking  into  account 
the  size  of  uncut  required  per  cliart  on  page  85,  and  .such  extra  a.s  may  ai)ply,  <riven  on  pii'^v  1 10. 

To  determine  ])rice  for  size  of  eye,  other  than  standard,  fi<j;ure  25  cents  per  dozen  i)airs 
extra  to  tlie  nearest  standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


COLORED 

Per  Dozen  Pflirs 

1 

0 

00 

000 

OOOK 

0000 

Jumbo 

Piano-Cylinder 

Flat 

0.12  to  2.00  1 

2.25  to  4.25           -^^ 

$1.50 

$1.70 

$2.00 

$2.50 

$3.00 

$3.00 

$3.50 

1.60 

1.80 

2.10 

2.60 

3.10 

3.10 

3.60 

4.50  to  6.00         o^^f  180° 

1.70 

1.90 

2.20 

2.70 

3.20 

3.20 

3.70 

6.50  to  8. 00  J  ^"    ^""  ^^^ 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

0.12  to  2.00 

1.70 

1.90 

2.20 

2.70 

3.20 

3.20 

3.70 

2 .  25  to  4 .  25  [       +  or  — 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

4 .  50  to  6 .  00     Other  Axes 

1.90 

2.10 

2.40 

2.90 

3.40 

3.40 

3.90 

6.50  to  8.00  J 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

Sphero-Cy  Under 

Flat 

0.12  to  2.00  1    +  O  +,  ^  O  -, 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

2 ,  25  to  4 .  25     +  O  -  or  -  O  + 

2.10 

2.30 

2.60 

3.10 

3.60 

3.60 

4.10 

4.50  to  6.00  1               Axes 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

6.50  to  8.00  J        90°  and  180° 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

0.12  to  2.00  ]      ,    --    ,           — 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

2.25  to  4.25  [  _T^  "^'       ^     ' 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

4.50  to  6.00  1  +    otlJ^xer 
6.50  to  8.00  J         "^"^^^  -^^^- 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

4.40 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

Plano-Cy  Under 

Toric 

0.12  to  2.00  1 
2.25  to  4.25  [        \^l^ 
4.50  to  6.00     qQO        J  i8,)o 
6.50  to  8. 00  J  ""    '^""  ^^' 

2.00 
2.10 

2.20 
2.30 

2.50 
2.60 

3.00 
3.10 

3.50 
3.60 

3.50 
3 .  60 

4.00 
4.10 

2.20 
2.30 

2.40 
2.50 

2.70 
2.80 

3.20 
3.30 

3.70 
3.80 

3.70 
3.80 

4.20 
4.30 

0.12  to  2.00  1 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

2 .  25  to  4 .  25  !       +  or  — 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

4 .  50  to  6 .  00     Other  Axes 

2.40 

2.60 

2.90 

3.40 

3.90 

3 .  90 

4.40 

6.50  to  8.00  J 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

Sphero-CyUnder 

Toric 

0 .  12  to  2 .  00  1    +  O  + ,  -  O  - , 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

2 .  25  to  4 .  25  [  +  O  -  or  -  O  + 

2.10 

2.30 

2.60 

3.10 

3.60 

3.60 

4.10 

4 .  50  to  6 .  00                 Axes 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

6.50  to  8.00  J        90°  and  180° 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

0.12  to  2.00  1      ,    ^    ,          ^ 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

2.25  to  4.25  i  J"^  "^'       ^     ' 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

4.50  to  6.00     ^  Tjther'AxeT 
6.50  to  8.00  J         Other  Axes 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

4.40 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

101 


B    \   u    sen 


L     O     M     B 


O    P    T    I    C    .\    L 


C    O    M     P    A    X    Y 


PRICES  FOR  BEVEL  AND  RIMLESS  EDGING 

CYLINDER,  FLAT   AND   TORIC 

REGULAR  OVAL 

(TO   BE  ADDED  TO   UNCUT   LENSES) 

To  obtain  prices  of  finished  lenses,  add  prices  given  below  to  price  of  uncut,  taking  into  account 
the  size  of  uncut  required  per  chart  on  page  85,  and  such  extra  as  may  apply,  given  on  page  110. 

To  determine  price  for  size  or  shape  of  eye,  otlier  than  .standard,  add  length  to  width  and 
figure  25  cents  per  dozen  pairs  extra  to  the  nearest  standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


Per  Dozen  Pairs 

WHITE 

1 

0 

00 

000 

000^ 

0000 

Jumbo 

Plano-Cylinder 

Flat 

0.12  to  2.00  1 

$1.00 

$1.20 

$1.50 

$2.00 

$2.50 

$2.50 

$3.00 

2.25  to  4.25            Yl, 
4.50  to  6.00      Qo°  and  180° 
6.50  to  8.00  J  "^"^    '^"*'  ^^" 

1.10 

1.30 

1.60 

2.10 

2.60 

2.60 

3.10 

1.20 
1.30 

1.40 
1.50 

1.70 
1.80 

2.20 
2.30 

2.70 
2.80 

2.70 
2.80 

3.20 
3.30 

0,12  to  2.00  ] 

1.20 

1.40 

1.70 

2.20 

2.70 

2.70 

3.20 

2 .  25  to  4 . 25  1       +  or  - 

1.30 

1.50 

1.80 

2.30 

2.80 

2.80 

3.30 

4 .  50  to  G .  00  1  Other  Axes 

1.40 

1.60 

1,90 

2.40 

2.90 

2.90 

3.40 

6 .  50  to  8 .  00  J 

1.50 

1.70 

2.00 

2.50 

3.00 

3.00 

3.50 

Spliero-Cylinder 

Flat 

0.12  to  2.00  1     +0+,-0-, 

1.50 

1.70 

2.00 

2.50 

3.00 

3.00 

3.50 

2 .  25  to  4 .  25  1    +  O  -  or  -  O  + 

1.60 

1.80 

2.10 

2.60 

3.10 

3.10 

3.60 

4.50  to  6.00  '               Axes 
6.50  to  8.00  J         90°  and  180° 

1.70 

1.90 

2.20 

2.70 

3.20 

3.20 

3.70 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

0.12  to  2.00  1      ,    ^    ,          ^ 
2.25  to  4.25   1    ,V^  ^'       ^     ' 
4.50  to  6.00      "^  7.,,    °'.      ^  "^ 
6.50  to  8.00  J         Other  Axes 

1.70 

1.90 

2.20 

2.70 

3.20 

3.20 

3.70 

1.80 
1.90 

2.00 
2.10 

2.30 
2.40 

2.80 
2.90 

3.30 
3.40 

3.30 
3.40 

3.80 
3.90 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

Piano-Cylinder 

Toric 

0.12  to  2.00  1          , 

1.50 

1.70 

2.00 

2.50 

3.00 

3.00 

3.50 

2.25  to  4.25            t  °'" 
4.50  to  6.00  '  „..o       fiono 
6.50  to  8.00  J  ^f    '■'"••  ^^'> 

1.60 

1.80 

2.10 

2.60 

3.10 

3.10 

3.60 

1.70 

1.90 

2.20 

2.70 

3.20 

3.20 

3.70 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

0.12  to  2.00  1 

1.70 

1.90 

2.20 

2.70 

3.20 

3.20 

3.70 

2 .  25  to  4 .  25            +  or  - 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

4 .  50  to  6 .  00        Other  Axes 

1.90 

2.10 

2.40 

2.90 

3.40 

3.40 

3.90 

6.50  to  8.00  J 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

Sphero-Cylinder 

Toric 

0.12  to  2.00  1     +  0+,  -  0-, 

1.50 

1.70 

2.00 

2.50 

3.00 

3.00 

3.50 

2 .  25  to  4 .  25  1   +  0  -  or  -  0  + 

1.60 

1.80 

2.10 

2.60 

3.10 

3.10 

3.60 

4 .  50  to  6 .  00  1                Axes 

1.70 

1.90 

2.20 

2.70 

3.20 

3.20 

3.70 

6.50  to  8.00  J        90°  and  180° 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

0.12  to  2.00  1      ,    ^    ,           -, 
2.25  to  4.25      ^^  +'        •3:.^     ' 

1.70 
1.80 

1.90 
2.00 

2.20 
2.30 

2.70 
2.80 

3.20 
3.30 

3.20 
3.30 

3,70 
3.80 

4.50  to  6.00  ^   Other" Axes^ 
6.50  to  8.00            Other  Axes 

1.90 

2.10 

2.40 

2.90 

3.40 

3.40 

3.90 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

102 


L    o    M    n 


o   1'    r  I   (•  .\   L 


(•    <)    M     r    .\    N    Y 


PRICES  FOR   BEVEL  AND  RIMLESS   EDGING 

CYLINDER,  FLAT   AND   TORIC 

REGULAR  OVAL 

(TO   BE   ADDED  TO   UNCUT   LENSES) 

To  obtain  prices  of  finished  lenses,  add  prices  given  below  to  price  of  uncut,  taking  into  account 
the  size  of  uncut  required  per  chart  on  page  85,  and  such  extra  as  may  apply,  given  on  page  110. 

To  determine  price  for  size  or  shape  of  eye,  other  than  standard,  add  length  to  width  and 
figure  25  cents  per  dozen  jiairs  extra  to  tiie  nearest  standard  eye  size. 

For  the  re(iuired  uncut  size,  consult  chart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


Per  Dozen  Pairs 

COLORED 

1 

0 

00 

000 

000  V 

0000 

Jumbo 

Piano-Cylinder 

Flat 
0.12  to  2.00] 
2.25  to  4.25  1          \^^^ 

6 .  oO  to  8 .  00  J 

$1.20 
1.30 
1.40 
1.50 

$1.40 
1.50 
1.60 
1.70 

$1.70 
1 .  80 
1.90 
2.00 

$2 .  20 
2.30 
2.40 
2.50 

$2 .  70 
2.80 
2.90 
3.00 

$2 .  70 
2.80 
2.90 
3.00 

$3 .  20 
3.30 
3.40 
3.50 

0.12  to  2.00  1 
2 . 25  to  4 . 25   1        +  or  - 
4.50  to  6.00  1  Other  Axes 
6.50  to  8.00  J 

1.40 
1.50 
1.60 
1.70 

1.60 
1.70 
1.80 
1.90 

1.90 
2 .  00 
2.10 
2.20 

2.40 
2.50 
2.60 
2.70 

2.90 
3.00 
3.10 
3.20 

2.90 
3.00 
3.10 
3.20 

3.40 
3.50 
3.60 
3.70 

Sphero-Cylinder 

Flat 
0.12  to  2.00  ]     +  0+,  -  0-, 
2 ,  25  to  4 .  25  ,    +  O  -  or  -  O  + 
4.50  to  6.00  '               Axes 
6.50  to  8.00  J        90°  and  180° 

1.70 
1.80 
1.90 
2.00 

1.90 
2.00 
2.10 
2.20 

2.20 
2.30 
2.40 
2.50 

2.70 
2.80 
2.90 
3.00 

3.20 
3.30 
3.40 
3.50 

3.20 
3.30 
3.40 
3.50 

3.70 
3.80 
3.90 
4.00 

0.12  to  2.00  1      ,    ^    ,          ^ 
2.25  to  4.25        "^^  ^'        X     ' 
4.50  to  6.00      "^  7^,,  oi        --  + 
6.50  to  8.00  J          Other  Axes 

1.90 
2.00 
2.10 
2.20 

2.10 
2.20 
2.30 
2.40 

2.40 
2.50 
2.60 
2.70 

2 .  90 
3.00 
3.10 
3.20 

3.40 
3.50 
3.60 
3.70 

3.40 
3.50 
3.60 
3.70 

3.90 
4.00 
4.10 
4.20 

Piano-Cylinder 

Toric 

0.12  to  2.00  1 
2.25  to  4.25            \^l 
4.50  to  6.00  ^onornTi8n° 
6.50  to  8.00  J  ^^    ^"''  1^^ 

1.70 
1.80 
1.90 
2.00 

1.90 
2.00 
2.10 
2.20 

2.20 
2.30 
2.40 
2.50 

2.70 
2.80 
2.90 
3.00 

3.20 
3.30 
3.40 
3.50 

3.20 
3.30 
3.40 
3.50 

3.70 
3.80 
3.90 
4.00 

0.12  to  2.00  ] 
2 .  25  to  4 . 25   !       +  or  - 
4 .  50  to  6 .  00  j  Other  Axes 
6.50  to  8.00  J 

1.90 
2.00 
2.10 
2.20 

2.10 
2 .  20 
2.30 
2.40 

2 .  40 
2.50 
2.60 
2.70 

2 .  90 

3 .  00 
3.10 
3.20 

3.40 
3.50 
3.60 
3.70 

3.40 
3.50 
3.60 
3.70 

3.90 
4.00 
4.10 
4.20 

Sphero-Cylinder 

Toric 

0.12  to  2.00]      +0+,-0-, 
2 .  25  to  4 .  25  1    +  C  -  or  -  O  + 
4 .  50  to  6 .  00  1               Axes 
6.50  to  8.00  J         90°  and  180° 

1.70 
1.80 
1.90 
2.00 

1 .  90 

2 .  00 
2.10 
2.20 

2.20 
2.30 
2.40 
2.50 

2.70 
2.80 
2.90 
3.00 

3.20 
3.30 
3.40 
3.50 

3.20 
3.30 
3.40 
3.50 

3.70 
3.80 
3.90 
4.00 

0.12  to  2.00  1      ,    -,    ,          ^ 
2.25  to  4.25      J  ^  ^'       X   ,  ' 

4.50  to  6.00      +    OtherAxes^ 
6.50  to  8.00  J         'JtlierAxes 

1.90 
2.00 
2.10 
2.20 

2.10 
2.20 
2.30 
2.40 

2.40 
2.50 
2.60 

2.70 

2.90 
3.00 
3.10 
3.20 

3  40 
3.50 
3.60 
3.70 

3.40 
3.50 
3.60 
3.70 

3.90 
4.00 
4.10 
4.20 

103 


LOME 


OPTICAL 


C    O    M     P    A    X    Y 


PRICES  FOR  BEVEL  AND  RIMLESS  EDGING 

CYLINDER,  FLAT   AND  TORIC 

FULL  AND  SHORT  OVAL 

(TO   BE  ADDED  TO  UNCUT  LENSES) 

To  obtain  prices  of  finished  lenses,  adfl  prices  given  below  to  price  of  uncut,  taking  into  account 
the  size  of  uncut  required  per  chart  on  page  85,  and  such  extra  as  may  apjily,  given  on  page  110. 

To  determine  price  for  size  or  shape  of  eye,  other  than  standard,  add  length  to  width  and 
figure  25  cents  per  dozen  pairs  extra  to  the  nearest  standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


Per  Dozen  Pairs 


Piano-Cylinder 


Flat 

+  or  — 

Axes 

90°  and  180° 


0.12  to  2.00 
2 .  25  to  4 . 25 
4 .  50  to  6 .  00 
6 .  50  to  8 .  00 

0.12  to  2.00  1 
2 . 25  to  4 .  25  I        +  or  - 
4 .  50  to  () .  00  (    Other  Axes 
6 .  50  to  8 .  00  J 

Sphero-Cy  Under 


0.12  to  2.00 
2 .  25  to  4 .  25 
4.50  to  GOO 
6 .  50  to  8 .  00 

0.12  to  2.00 
2 .  25  to  4 .  25 
4 .  50  to  (i .  00 
6 .  50  to  8 .  00 


Flat 


+  ,  - 


+ 
+ 


Axes 
90°  and  180° 

C5  —  or  —  O 
Other  Axes 


Piano-Cylinder 

Torjc 

0.12  to  2.00 
2 .  25  to  4 .  25 
4 .  50  to  6 .  00 
6.50  to  8.00 


+  or  — 

Axes 

90°  and  180° 


0.12  to  2.00  1 
2 . 25  to  4 . 25  !         +  or  - 
4 .  50  to  6 .  00  f    Other  Axes 
6.50  to  8.00  J 

Sphero-Cylinder 
Toric 

0.12  to  2.00  1  +  o  +,  -  O  - 
2 .  25  to  4 .  25  I  +  O  -  or  -  O 
4.50  to  6.00  I  Axes 

6.50  to  8.00  )        90°  and  180° 


0.12  to  2.00 
2 .  25  to  4 .  25 
4 .  50  to  6 .  00 
6 .  50  to  8 .  00 


+  O  -  or  -  O  +' 
Other  Axes 


WHITE 


$1 .  25 
1.35 
1.45 
1.55 

1.45 
1.55 
1.65 
1.75 


1.75 
1.85 
1.95 
2.05 

1.95 
2.05 
2.15 

2.25 


1.75 
1.85 
1.95 
2.05 

1.95 
2.05 
2.15 

2.25 


1.75 
1.85 
1.95 
2.05 

1.95 
2.05 
2.15 
2.25 


00 


$1.45 
1.55 
1.65 
1.75 

1.65 
1.75 

1.85 
1.95 


1.95 
2.05 
2.15 
2.25 

2.15 

2.25 
2.35 
2.45 


1.95 
2.05 
2.15 
2.25 

2.15 
2.25 
2.35 
2.45 


1.95 
2.05 
2.15 

2.25 

2.15 
2.25 
2.35 
2.45 


$1.75 
1.85 
1.95 
2.05 

1.95 
2.05 
2.15 
2.25 


2.25 
2.35 
2.45 
2.55 

2.45 
2.55 
2.65 
2.75 


2.25 
2.35 
2.45 
2.55 

2.45 
2.55 
2.65 
2.75 


2.25 
2.35 
2.45 
2.55 

2.45 
2.55 
2.65 

2.75 


000 


B2.25 
2.35 
2.45 
2.55 

2.45 
2.55 
2.65 

2.75 


2.75 
2.85 
2.95 
3.05 

2.95 
3.05 
3.15 
3.25 


2.75 
2.85 
2.95 
3.05 

2.95 
3.05 
3.15 
3.25 


2.75 
2.85 
2.95 
3.05 

2.95 
3.05 
3.15 
3.25 


wm 


0000 


$2.75 

$2.75 

2.85 

2.85 

2.95 

2.95 

3.05 

3.05 

2.95 

2.95 

3.05 

3.05 

3.15 

3.15 

3.25 

3.25 

3.25 

3.25 

3.35 

3.35 

3.45 

3.45 

3.55 

3.55 

3.45 

3.45 

3.55 

3.55 

3.65 

3.65 

3.75 

3.75 

3.25 

3.25 

3.35 

3.35 

3.45 

3.45 

3.55 

3.55 

3.45 

3.45 

3.55 

3.55 

3.65 

3.65 

3.75 

3.75 

3.25 

3.25 

3.35 

3.35 

3.45 

3.45 

3.55 

3.55 

3.45 

3.45 

3.55 

3.55 

3.65 

3.65 

3.75 

3.75 

Jumbo 


$3.25 
3.35 
3.45 
3.55 

3.45 
3.55 
3.65 
3.75 


3.75 
3.85 
3.95 
4.05 

3.95 
4.05 
4.15 
4.25 


3.75 
3.85 
3.95 
4.05 

3.95 
4.05 
4.15 
4.25 


3.75 
3.85 
3.95 
4.05 

3.95 
4.05 
4.15 
4.25 


104 


XT      S     C      II 


L     O     M      I? 


<)     I'    T     1     ('     .\     L 


<•    ()    M     1*    .\     \    Y 


PRICES  FOR   BEVEL  AND  RIMLESS  EDGING 

CYLINDER,  FLAT  AND   TORIC 

FULL  AND  SHORT  OVAL 

(TO   BE  ADDED  TO   UNCUT   LENSES) 

To  obtain  prices  of  finished  lenses,  add  prices  given  below  to  price  of  uncnt,  taking  into  account 
the  size  of  nncnt  reqnired  i)er  chart  on  page  85,  and  such  extra  as  may  apply,  given  on  |)agc  1 10. 

To  determine  price  for  size  or  shape  of  eye,  other  than  standard,  add  Iciigtii  to  width  and 
figure  25  cents  per  dozen  pairs  extra  to  the  nearest  standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


Per  Dozen  Pairs 

COLORED 

1 

0 

00 

000 

om 

0000 

Jumbo 

Plano-Cylinder 

Flat 
0.12  to  2.00  1 
2.25  to  4.25  [        \°^^^ 

4.50  to  6.00     90°  .,„j  180° 
6.50  to  8. 00  J  -^^    ^""^  ^^'^ 

$1.45 
1.55 
1.65 
1.75 

$1.65 
1.75 
1.85 
1.95 

$1.95 
2.05 
2.15 

2.25 

$2.45 
2.55 
2.65 

2.75 

$2.95 
3.05 
3.15 
3.25 

$2.95 
3.05 
3.15 
3.25 

$3.45 
3 .  55 
3.65 
3.75 

0.12  to  2.00  1 
2 .  25  to  4 .  25           +  or  — 
4 .  50  to  6 .  00      Other  Axes 
6.50  to  8.00  . 

1.65 
1.75 

1.85 
1.95 

1.85 
1.95 
2.05 
2.15 

2.15 

2.25 
2.35 
2.45 

2.65 

2.75 
2.85 
2.95 

3.15 
3.25 
3.35 
3.45 

3.15 
3.25 
3.35 
3.45 

3.65 
3.75 
3.85 
3.95 

Sphero-Cylinder 

Flat 
0.12  to  2.00  1    +  O  +,  -  O  -, 
2 .  25  to  4 .  25      +  O  -  or  -  O  + 
4 .  50  to  6 .  00                  Axes 
6.50  to  8.00          90°  and  180° 

1.95 
2.05 
2.15 
2.25 

2.15 
2.25 
2.35 
2.45 

2.45 
2.55 
2.65 
2.75 

2.95 
3.05 
3.15 
3.25 

3.45 
3.55 
3.65 
3.75 

3.45 
3.55 
3.65 
3.75 

3.95 
4.05 
4.15 
4.25 

0.12  to  2.00  1      ,    -.    ,         ^ 
2.25  to  4.25       T'^      '      ^    ; 

4.50  to  6.00      ^    other  AxeT 
6.50  to  8.00           Other  Axes 

2.15 
2.25 
2.35 
2.45 

2.35 
2.45 
2.55 
2.65 

2.65 
2.75 
2.85 
2.95 

3.15 
3.25 
3.35 
3.45 

3.65 
3.75 
3.85 
3.95 

3.65 
3.75 
3.85 
3.95 

4.15 
4.25 
4.35 
4.45 

Piano-Cylinder 

Toric 

0.12  to  2.00  1 

2.25  to  4.25  [        +^^^^ 

4 .  50  to  6 .  00     f,^o        1  1 0AO 

6.50  to  8.00  P"^"^^  1^0 

1.95 
2.05 
2.15 
2.25 

2.15 
2.25 
2.35 
2.45 

2.45 
2.55 
2.65 

2.75 

2.95 
3.05 
3.15 
3.25 

3.45 
3.55 
3.65 
3.75 

3.45 
3.55 
3.65 
3.75 

3.95 
4.05 
4.15 
4.25 

0.12  to  2.00 
2 .  25  to  4 .  25           +  or  - 
4 .  50  to  6 .  00      Other  Axes 
6.50  to  8.00 

2.15 
2  25 
2^35 
2.45 

2.35 
2.45 
2.55 
2.65 

2.65 

2.75 
2.85 
2.95 

3.15 
3.25 
3.35 
3.45 

3.65 
3.75 
3.85 
3.95 

3.65 
3.75 
3.85 
3.95 

4.15 
4.25 
4.35 
4.45 

Sphero-Cyijnder 

Toric 
0.12  to  2.00  1    +0+,-0-, 
2 .  25  to  4 .  25      +  O  -  or  -  C  + 
4 .  50  to  6 .  00                  Axes 
6.50  to  8.00  J        90°  and  180° 

1.95 
2.05 
2.15 
2.25 

2.15 

2.25 
2.35 
2.45 

2.45 
2.55 
2.65 

2.75 

2.95 
3.05 
3.15 
3.25 

3.45 
3.55 
3.65 
3.75 

3.45 
3.55 
3.65 
3.75 

3.95 
4.05 
4.15 
4.25 

0.12  to  2.001     ,    ^    ,          ^ 
2.25  to  4.25      7;X      '       X^    ' 

4.50  to  6.00     +  Tjther'AxeT 
6.50  to  8.00  J         UtnerAxes 

2.15 
2.25 
2.35 
2.45 

2.35 
2.45 
2.55 
2.65 

2.65 

2.75 
2.85 
2.95 

3.15 
3.25 
3.35 
3.45 

3.65 
3.75 
3.85 
3.95 

3.65 
3.75 
3.85 
3.95 

4.15 
4.25 
4.35 
4.45 

105 


L     O     M      B 


O     I'    T    I    C    \    L 


C    O    M     I>    A    N    Y 


PRICES  FOR   BEVEL  AND  RIMLESS  EDGING 

CYLINDER,  FLAT   AND   TORIC 

DROP  OVAL 

(TO   BE  ADDED  TO   UNCUT   LENSES) 

To  ol)tain  prices  of  finished  lenses,  add  jjrices  rriven  Ijelow  to  price  of  uncut,  taking  into  account 
the  size  of  uncut  required  per  chart  on  page  85,  and  such  extra  as  may  apply,  given  on  page  110. 

To  determine  price  for  size  or  shape  of  eye,  other  than  standard,  add  length  to  width  and 
figure  25  cents  per  dozen  pairs  extra  to  the  nearest  standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


WHITE 

Per  Dozen  Pairs 

1 

0 

00 

000 

000^ 

0000 

Jumbo 

Piano-Cylinder 

Flat 

0.12  to  2. 00 
2.25  to  4.25           "^"' 
4.50  to  G.OO  f  ,,,,o        1  ,o,,o 
6.50  to  8.00  J  '^'^    «"''l^^' 

$1.50 

$1.70 

$2 .  00 

$2 .  50 

$3 .  00 

$3.00 

$3 ,  50 

1 .  60 

1.80 

2.10 

2 .  GO 

3.10 

3.10 

3.60 

1 .  70 

1.90 

2.20 

2 .  70 

3.20 

3.20 

3.70 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

0.12  to  2.00 

1.70 

1.90 

2 .  20 

2.70 

3.20 

3.20 

3.70 

2 .  25  to  4  .  25            +  or  - 

1.80 

2.00 

2.30 

2.80 

3.30 

3.30 

3.80 

4.50  to  6.00      Other  Axes 

1.90 

2.10 

2.40 

2.90 

3.40 

3.40 

3.90 

6.50  to  8.00  ] 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

Sphero-Cy  Under 

Flat 

0.12  to  2.00  1    +  0+,  -  O  -, 

2.00 

2.20 

2.50 

3.00 

3 .  50 

3 .  50 

4 .  00 

2.25  to  4.25      +  O  -or-  O    f 

2.10 

2.30 

2 .  60 

3.10 

3.60 

3 .  60 

4.10 

4.50  to  G.OO  1               Axes 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4 ,  20 

6.50  to  8.00  1        90°  and  180° 

2 .  30 

2.50 

2.80 

3.30 

3.80 

3.80 

4,30 

0.12  to  2.00  1      ,    ^    ,          ^ 

2.25  to  4.25      7"^  +'       ^     ' 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4,20 

2.30 

2.50 

2 .  80 

3.30 

3.80 

3.80 

4.30 

4.50  to  6.00     ^  7.,,   °'\     '^  ^ 
6.50  to  8.00           Other  Axes 

2.40 

2.60 

2 .  90 

3.40 

3.90 

3.90 

4.40 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

Piano-Cylinder 

Toric 

0.12  to  2.00  1 

2.00 

2.20 

2 .  50 

3.00 

3.50 

3.50 

4.00 

2.25  to  4.25           +°' 

4.50  to  6.00  f  „„o        1  Lno 
ami     0  An     00    an(    180 
6 .  50  to  8 .  00 

2.10 

2.30 

2 .  60 

3.10 

3,60 

3,60 

4.10 

2.20 

2.40 

2 .  70 

3.20 

3.70 

3.70 

4.20 

2 .  30 

2.50 

2 .  80 

3.30 

3.80 

3.80 

4.30 

0.12  to  2.00 

2 .  25  to  4 .  25  1        +  or  - 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4 ,  30 

4 .  50  to  6 .  00      Other  Axes 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

4.40 

6.50  to  8.00 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

Sphero-Cylinder 

Toric 

0.12  to  2.00  1    +0+,-0-, 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

2 .  25  to  4 .  25      +  O  -  or  -  O  + 

2.10 

2.30 

2.60 

3.10 

3.60 

3.60 

4.10 

4 .  50  to  6 .  00                  Axes 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

6.50  to  8.00  [        90°  and  180° 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

0.12  to  2.00  1      ,    .^    ,          ^ 

2.25  to  4.25     _7^  +'       ^     ' 

2 .  20 
2.30 

2.40 
2 .  50 

2,70 
2.80 

3.20 
3.30 

3.70 
3.80 

3.70 
3.80 

4.20 
4.30 

4.50  to  6.00     +-^°».-^  + 
6.50  to  8.00  J         utner  Axes 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

4.40 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

106 


B     A     r      S     C      II 


L     O     M      15 


O     I'    T    1     (■    .\     L 


('    ()    M     r    .\    N    \ 


PRICES  FOR  BEVEL  AND  RIMLESS  EDGING 

CYLINDER,  FLAT   AND   TORIC 

DROP  OVAL 

(TO   BE  ADDED  TO   UNCUT   LENSES) 

To  obtain  jirice.s  of  finished  Icii.so.s,  add  prices  jfiven  l)elow  to  price  of  uncut,  taking  into  account 
the  size  of  uncut  required  per  chart  on  pa<i;e  85,  and  .such  extra  as  may  apply,  ptiven  on  pafje  110. 

To  determine  price  for  .size  or  shape  of  eye,  other  than  standard,  add  lengtli  to  width  and 
figure  25  cents  per  dozen  pairs  extra  to  the  neare.st  standard  eye  size. 

For  the  required  uncut  size,  consult  chart  on  page  85. 

Prices  for  Edging  not  listed,  will  be  given  on  request. 


COLORED 

Per  Dozen  Pairs 

1 

0 

00 

000 

000^ 

OOflO 

Jumbo 

Piano-Cylinder 

Flat 

0.12  to  2.00 

2.25  to  4.25           +^4^ 

«-n!°eon     90°  and  180° 
6 .  aO  to  8 .  00  J 

$1.70 
1.80 

$1.90 
2.00 

$2.20 
2.30 

$2.70 
2.80 

$3.20 
3.30 

$3.20 
3.30 

$3.70 
3.80 

1.90 
2.00 

2.10 

2.20 

2.40 
2.50 

2.90 
3.00 

3.40 
3.50 

3.40 
3.50 

3.90 
4.00 

0.12  to  2.00  1 

1.90 

2.10 

2.40 

2.90 

3.40 

3.40 

3.90 

2 .  25  to  4 .  25           +  or  — 

2.00 

2.20 

2.50 

3.00 

3.50 

3.50 

4.00 

4 .  50  to  6 .  00       Other  Axes 

2.10 

2.30 

2.60 

3.10 

3.60 

3.60 

4.10 

6 .  50  to  8 .  00  J 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

Sphero-Cylinder 

Flat 

0.12  to  2.00  1    +  O  +,  -  O  -, 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

2 .  25  to  4 .  25      +  O  -  or  -  O  + 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

4 .  50  to  6 .  00                  Axes 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

4.40 

6.50  to  8.00  J        90°  and  180° 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

0.12  to  2.00  1      ,    ^    ,          ^ 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

4.40 

2,25  to  4.25     _T^      '       ^.    ,' 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

4.50  to  6.00     +Q°V.„s^^ 
6.50  to  8.00  J        '-'tnei  Axes 

2.60 

2.80 

3.10 

3.60 

4.10 

4.10 

4.60 

2.70 

2.90 

3.20 

3.70 

4.20 

4.20 

4.70 

Piano-Cylinder 

Toric 

0.12  to  2.00  1 

2.25  to  4.25  [        +°J^ 

tinl^'lnn     90°  and  180° 
6.50  to  8.00  J 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

4.40 

2.50 

2.70 

3.00 

3.50 

4,00 

4.00 

4.50 

0.12  to  2.00 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

4.40 

2.25  to  4.25            +  o^- 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

4 .  50  to  6 .  00      Other  Axes 

2.60 

2.80 

3.10 

3.60 

4,10 

4.10 

4.60 

6.50  to  8.00 

2.70 

2.90 

3.20 

3.70 

4,20 

4.20 

4.70 

Sphero-Cylinder 

Toric 

0.12  to  2.001    +  O  +,  -  O  -, 

2.20 

2.40 

2.70 

3.20 

3.70 

3.70 

4.20 

2 .  25  to  4 .  25      +  O  -  or  -  O  + 

2.30 

2.50 

2.80 

3.30 

3.80 

3.80 

4.30 

4.50  to  6.00                  Axes 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

i     4.40 

6.50  to  8.00  J        90°  and  180° 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

0.12  to  2.00  1      ,    ^    ,          ^ 

2.40 

2.60 

2.90 

3.40 

3.90 

3.90 

4.40 

2.25  to  4.25  1  ^^  ^'       ^     ' 

2.50 

2.70 

3.00 

3.50 

4.00 

4.00 

4.50 

4.50  to  6.00     ^  other  Axes^ 
6.50  to  8.00  J        Other  Axes 

2.60 

2.80 

3.10 

3.60 

4.10 

4.10 

4.60 

2.70 

2.90 

3.20 

3.70 

4.20 

4.20 

4.70 

107 


B     A     U      S     C      H 


L      O      M      B        /C55!SSx         OPTICAL  C    O    M     P    A     N    Y 


PRICES   FOR   DRILLING   WHITE    EDGED    LENSES 


HOLES 

Per  Dozen  Pairs 

1 

2 

3 

4 

Piano 

Flat 

$0.20 

$0.30 

$0.40 

$0.50 

1.2.5  Curve. 

.20 
.20 
.30 

.30 

.40 

'.60 

.40 
.60 
.90 

.50 

(i.OO  Curve 

.80 

9.00  Curve 

1.20 

Sphere 

Piano         ) 

Double       [  +  0.12  to  8.00     .... 

Periscopic  ) 

.20 

.30 

.40 

.50 

Piano          ) 

Double       [  -  0.12  to  8.00     .    .    .    . 

Periscopic  j 

.20 

.30 

.40 

.50 

Meniscus 

—  6.00  Base  Curve 

0.12  to  8.00+ 

.20 

.40 

.60 

.80 

Meniscus 

+  6.00  Base  Curve 

0.12  to  8.00  -        

.20 
.20 

.50 
.30 

.80 
.40 

1.00 

Coquille 

.50 

Mi-Coquilie 

.20 

.30 

.40 

.50 

Plano-Cylinder 

Flat 

+  or  -  Axe.s  90°  and  180° 

0.12  to  8.00 

.20 

.40 

.60 

.80 

+  or  —  Other  Axes 

0.12  to  8.00 

.20 

.40 

.60 

.80 

Sphero-Cylinder 

Flat 

+  0+,-0-,+0-or-0  + 

Axes  90°  and  180° 

0.12  to  8.00 

.20 

.40 

.60 

.80 

+  O  +,  —  C  -  ,   -t-  O  —  or  —  O  + 

Other  Axes 

0.12  to  8.00 

.20 

.40 

.(iO 

.80 

Piano-Cylinder 

Toric 

+  or  -  Axes  90°  and  180° 

0.12  to  8.00  

.30 

.60 

.90 

1.20 

+  or  —  Other  Axes 

0.12  to  8.00 

.30 

.60 

.90 

1.20 

Sphero-Cylinder 

Toric 

+  0+,  —  O— ,  +0  —  or  —  0  + 

Axes  90°  and  180° 

0.12  to  8.00 

.30 

.60 

.90 

1.20 

+  0+,-0-,  +  0-or-0  + 

Other  Axes 

0.12  to  8.00 

.30 

.60 

.90 

1.20 

Piano  Prisms 

0.50  to  3. 50 A 

.20 

.40 

.60 

.80 

Sphero-Prisms 

0.50  to  3. 50 A 

.20 

.40 

.60 

.80 

Cylinder-Prisms 

0.50  to  3.50A    .    .    .    ., 

.20 

.40 

.60 

.80 

108 


n    .\    r    .s    c    H 


L    o    M     H      /SS^!2^      ')   I'  T   I    (•   .\    I.        <■   ()   .M    r  .\    .\   Y 


PRICES  FOR  DRILLING  COLORED  EDGED  LENSES 


HOLES 

Per  Dozen  Pairs 

1 

2 

3 

4 

Piano 

Flat      

$0.30 

$0.  10 

$0.50 
.50 

$0.60 
.60 

1 . 2.5  Curve 

.30 

.40 

6 .  00  Curve 

.40 

.00 

.80 

1  .  00 

9.00  Curve 

.50 

.80 

1.10 

1    40 

Sphero 

Piano          ] 

Double        ^  +  0.12  to  8.00     .... 

.30 

.40 

.50 

.60 

Periscopic  ) 

Piano         ) 

Double          -  0.12  to  8.00     .    .    .    . 

.30 

.40 

.50 

.60 

Periscopic  J 

Meniscus 

—  6.00  Base  Curve 

0.12  to  8.00+       

AO 

.60 

.80 

1.00 

Meniscus 

+  6.00  Base  Curve 

0.12  to  8.00  -       

.40 

.70 

1.00 

1.20 

Coquille       

.20 

.30 

.40 

.50 

INIi-Coquille 

.20 

.30 

.40 

.50 

Plano-Cylinder 

Flat 

+  or  -  Axes  90°  and  180° 

0.12  to  8.00  

.40 

.60 

.80 

1   00 

+  or  —  Other  Axes 

0.12  to  8.00 

.40 

.60 

.80 

1  .  00 

Spheio-Cylinder 

Flat 

+  0+,-0-,  +  0-  or  -0  + 

Axes  90°  and  180° 

0.12  to  8.00 

.40 

.60 

.80 

1.00 

+  O  +,  -  O  -,  +  O  -  or  -  O  -h 

Other  Axes 

0.12  to  8.00 

.40 

.60 

.80 

1.00 

Plano-Cylinder 

Toric 

+  or  -  A.xes  90°  and  180° 

0.12  to  8.00 

.50 

.80 

1.10 

1.40 

+  or  —  Other  Axes 

0.12  to  8.00 

.50 

.80 

1    10 

1.40 

Sphero-Cyiinder 

Toric 

+  Cr+,-0-,  +  0-or-0  + 

Axes  90°  and  180° 

0.12  to  8.00 

.50 

.80 

1.10 

1.40 

+  0  +  ,-0-,+0-or-04- 

Other  Axes 

0.12  to  8.00 

.50 

.80 

1.10 

1.40 

109 


B     A     U      S      C      H  &  L      O      M      B        /^HS^        O     P    T    I     r     A     L  C    O    M     P    A     N    Y 


PRICES  FOR  BEVEL  AND  RIMLESS  EDGING 
PRISMS 


38  mm  Rd. 

38  mm  Sq. 

1 

0 

00 

000 

Piano-Prisms 

0 .  50  to  3 .  50  A 

Sr»hf»rr»-Pri«m« 

$2.00 

$3.70 

$2.00 

$2.20 

$2.50 

$3.50 

0 .  50  to  3 .  50  A    .    .    .    . 

Cylinder-Prisms 

0 .  50  to  3 .  50  A    .    .    .    . 


2.00 


3.70 


2.00 


3 .  00 


2.20 


3.20 


2.50 


3.50 


3.50 


4 .  50 


EXTRAS 

(ADD  TO  PRICE  OF  EDGED   LENSES) 


No. 


1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 


Item 


Polished  edge.s 

Centering  Sphero  lenses  to  1  eye 

Centering  Sphero  lenses  to  0  eye 

Centering  Sphero  lenses  to  00  eye 

Centering  Sphero  lenses  to  000  eye 

Centering  Cement  Wafers 

Centering  Perfection  Bifocal  l;p|»ers 

Centering  Perfection  Bifocal  Lowers 

Centering  Perfection  Bifocal  Lenses 

Long  oval  shape,  same  price  as  regnlar  oval 

German  Standard  No.  9,  same  price  as  1  eye  regular  oval      

German  Standard  No.  11,  same  price  as  0  eye  regnlar  oval 

German  Standard  No.  13,  same  price  as  00  eye  regular  oval  .... 
Australian  Standard  No.  2,  same  price  as  2  eye  regular  oval  .... 
Australian  Standard  No.  3,  same  price  as  1  eye  regnlar  oval  .... 
Australian  Standard  No.  4,  same  price  as  0  eye  regular  oval  .... 
Australian  Standard  No.  5,  same  price  as  00  eye  regular  oval  .... 
Australian  Standard  No.  10,  same  price  as  1  eye  regular  oval  .... 
Australian  Standard  No.  12,  same  price  as  0  eye  regular  oval    .... 

Clerical  Shapes  II,  add  to  different  sizes  of  eyes 

Clerical  Shapes  G,  add  to  tlifferent  sizes  of  eyes 

For  special  sizes  other  than  listed 

Edged  and  Split  Cement  Wafers,  add  to  J  price  of  uncut  cement  wafers 
Piano,  Sphero,  Piano-Cylinders  and  Prisms  matted  for  trial  cases  .  . 
Prescription  Prices  will  be  charged: 

a:    For  all  lenses  not  quoted  In'  the  dozen      

b:    For  special  foci 

c:    For  less  than  six  pairs  in  a  division  of  focus  numbers  or  piano  .    . 

d:  For  lenses  not  regularly  carried  in  stock,  when  ordered  in  small 
quantities ^ 


Price  per 
Dozen  Pairs 


75 


110 


B     A     IT      S     C      II  &  L     O     M      B       /V^S^       O     P    T    I     ("    A     I.  c    O    M     P    A    X    Y 


BIFOCAL  LENSES 

NEARLY  all  of  US  who  re(|iiiiv  olasscs  to  aid  our  iionnal  visiou  find  at 
some  time  that  we  need  lenses  of  difreieni  stren<rtlis  for  reading  and 
for  viewino-  distant  objects.  Then  we  become  interested  in  bifocals — 
glasses  with  an  upper  section  for  distant  vision  and  a  lower  section  of  different 
strength  for  reading,  or  other  close  eye  work. 

Before  the  days  of  Benjamin  Franklin  people  encumbered  themselves  with 
two  pairs  of  glasses  Avlien  their  eyes  were  in  this  condition,  but  that  [)ractice 
was  naturally  a  nuisance.  Franklin  conceived  the  idea  of  overcoming  this  by 
cutting  both  pairs  of  glasses  in  two  and  mounting  two  "distance"  halves  in  the 
same  frame  with  two  "reading"  halves.  The  uni(iue  product  of  the  inventor- 
statesman's  ingenuity  was  to  form  the  foundation  for  the  interesting  evolution 
of  a  most  useful  ophthalmic  line — bifocal  lenses. 

This  crude  beginning  was  a  step  in  advance  in  point  of  convenience  but 
these  "split"  bifocals,  as  well  as  the  cemented  types  developed  from  them, 
presented  many  disadvantages.  The  lines  of  separation  were  unsightly  in 
appearance  and  annoying  to  the  wearer.  Furthermore,  dirt  was  collected  in 
the  creases  and  segments  were  likely  to  drop  apai't  in  time. 

Optical  scientists  soon  perceived  then  that  the  ideal  bifocal  lens  must  elimi- 
nate these  marked  separation  lines  and  unequal  surfaces — in  other  words, 
that  it  must  be  of  one  piece  of  glass  or  its  equivalent.  Their  early  efforts  were 
both  imperfect  and  impracticable.  Many  difficulties  were  encountered,  and 
it  was  only  after  years  of  investigation  along  this  line  that  they  were  able  to 
devise  means  of  producing  such  a  lens,  both  optically  and  commercially 
practical.  Recent  results  of  their  endeavor  are  the  Kryptok  and  the  Ultex 
Onepiece  Bifocal  lenses,  among  the  highest  achievements  yet  recorded  in 
the  chronicle  of  optical  development. 

These  last  two  types  of  bifocal  lenses  are  ample  reward  for  long  experi- 
menting, to  bring  theories  within  the  range  of  practical  usage.  Their  vast 
superiorit}'  to  the  earlier  forms  of  bifocals  is  obvious,  since  they  are  solid 
lenses  with  no  disfiguring  lines  of  separation.  They  are  just  as  graceful  on  the 
face  as  any  ordinary  single  lenses  and  as  convenient  in  use.  The  Ultex  One- 
piece  Bifocals,  being  made  of  a  single  piece  of  crown  glass  of  our  regular 
refractive  index,  are  also  free  from  chromatic  aberration. 

The  different  types  of  bifocals  here  mentioned  are  illustrated  and  listed 
separately  on  the  following  pages. 


Ill 


BIFOCAL     LENSES 


SPLIT 


CEMENT 


OPIFEX 


PERFECTION 

( GROOVED ) 


PERFECTION 

( FLAT) 


112 


n     A     U      S     C      H  &  L      O      M      n        /^S^        O     P    T     I     r     A     L  <•    O    M     1'    A     \     V 


SPLIT   AND   CEMENT  BIFOCAL  LENSES 

split  Bifocal — This  1(mi.s  consists  of  two  half  lenses  of  varvini;-  power 
with  the  edoes.  wliich  are  in  contact,  i^ronnd  flat.  These  lenses  are  desiirned 
for  use  in  frames  only. 

Cement  Bifocal  —  In  this  bifocal  a  very  thin  wafer,  oval  or  round  in 
sha})e  and  oromid  to  the  j)roper  curves,  is  cemented  to  a  periscoj)ic  or  other 
form  of  lens  and  permits  of  a  range  of  reading  and  distance  foci  of  0.1'-2  to 
8.00  D.     The  Cement  Bifocal  is  a  very  popular  moderate  priced  lens. 

Perfection  Bifocal — A  modified  form  of  split  bifocal.  It  consists  of 
two  lenses  of  different  foci,  accurately  fitted  together.  The  lower  lens,  or 
reading  portion,  is  in  the  form  of  a  segment,  "-25  x  1'3  nmi,  while  the  upper,  or 
distance  lens,  is  shaped  as  illustrated.  These  parts  are  fitted  together  in 
two  ways :  by  means  of  a  grooved  bevel  edge  and  corresponding  groove,  or 
simply  with  the  contact  edges  flat  as  in  the  split  bifocal.  It  is  only  prac- 
ticable to  use  Perfection  Bifocals  in  frames  and  conse<|uently  they  are  sup- 
plied only  with  bevel  outside  edge  in  sizes  of  1,  0  and  00  eye. 

Opifex  Bifocal — These  lenses  are  an  improvement  upon  the  cement 
bifocal,  the  wafer  being  almost  invisible.  This  is  accomplished  by  grinding 
the  wafers  very  thin.  During  the  grinding  process  they  are  supported  l)y 
glass  bodies,  from  which  they  are  slid  off  onto  the  major  lens.  The  operation 
of  edffino;  the  wafers  is  done  while  thev  are  still  attached  to  the  glass  bodies, 
thus  insuring  a  perfect  knife  edge. 

These  lenses  are  ground  in  accordance  with  the  present  (D)  method  of  re- 
fraction.    They  neutralize  with   our  double  convex  and  concave  test  lenses. 


113 


B     A     U     sen 


L     O     M      B 


O     P    T    I     r    .\    L 


COM     P    A    N    Y 


PRICES   FOR   BIFOCAL  LENSES 


CENTEX 


BEVEL   OR    RIMLESS   EDGE 

Per  Dozen  Pairs 

Eye  Sizes 

1 

u 

00 

000 

Cement 

1.25  Curve 

0 .  12  to  2 .  00  1 

$4.50 

$4 .  60 

$4 .  75 

$5.00 

2 .  25  to  4 . 25  1 
4 .  50  to  G .  00      "•" 

5 .  00 

5.10 

5.25 

5.50 

5.50 

5.60 

5 .  75 

6.00 

6 .  50  to  8 .  00  J 

6.00 

6.10 

6.25 

6.50 

6.00  Curve 

0.12  to  2.00 

13.50 

13.65 

14.00 

14.35 

2.25  to  4.25 

15.00 

15.15 

15.50 

15.85 

4 .  50  to  C .  00     + 

16.50 

16.65 

17.00 

17.35 

6 .  50  to  8 .  00 

18.00 

18.15 

18.50 

18.85 

Opifex 

1.25  Curve 

0.12  to  2.00  / 
2 .  25  to  4 .  25  \  "^ 

11.25 

11.35 

1 1 .  50 

11.75 

12.75 

12.85 

13.00 

13.25 

6.00  Curve 

0.12  to  2.00  / 
2 .  25  to  4 .  25  \  "•" 

19.00 

H).15 

19.50 

19.85 

20.00 

20.15 

20.50 

20.85 

Split 

0.12  to  2.00  1 

1.75 

2.00 

2.25 

2.50 

2.25  to  4.25 
4.50  to  6.00     ■'' 

2.00 

2.25 

2.50 

2.75 

2.25 

2.50 

2.75 

3.00 

6 .  50  to  8 .  00  J 

2.50 

2 .  75 

3.00 

3.25 

Perfection 

Grooved  or  Flat 

0.12  to  2.00 

3.75 

3.90 

4 .  05 

4.40 

2 .  25  to  4 .  25  [ 
4.50  to  6.00     "^ 

4.00 

4.15 

4.30 

4.65 

4.25 

4.40 

4 .  55 

4.90 

6 .  50  to  8 .  00 

4 .  50 

4 .  65 

4.80 

5.15 

Perfection 

Uppers 

Grooved  or  Flat 

0.12  to  2.00 

2.25 

2.40 

2.55 

2.90 

2 .  25  to  4 .  25  I 
4.50  to  6.00     "•" 

2.40 

2.55 

2.70 

3.05 

2.55 

2.70 

2.85 

3.20 

6.50  to  8.00 

2 .  70 

2.85 

3 .  00 

3.35 

Perfection 

Lowers 

Grooved  or  Flat 

0.12  to  2.00 

1.50 

1.50 

1.50 

1.50 

2.25  to  4.25  ,  ^ 

1.60 

1.60 

1.60 

1.60 

4 .  50  to  G .  00 

1.70 

1.70 

1.70 

1.70 

6.50  to  8.00. 

1.80 

1.80 

1.80 

1.80 

DRILLING    BIFOCAL   LENSES 


Per  Dozen  Pairs 

1  Hole 

2  Holes 

3  Holes 

4  Holes 

$0.20 

$0.25 

$0.30 

$0.40 

114 


B     A    U     S     C     H 


L     O     M     n 


O     I'    T    I     (•    .\     h 


C    ()    M     I'    .\    \    Y 


PRICES   FOR   BIFOCAL  WAFERS 
CENTEX 


Per  Dozen  Pairs 

1.25  Curve 

+ 

Piano 

+ 

Other 
Curves 

Uncut 

Cement 

(CharKed    ac- 
cording to 
strongest 
curve) 

(Round  30  mm  Diameter) 

0.12  to  2.00 

$,'5 .  00 

.$4.50 

$7.. 50 

2.25  to  4.25 

3.75 

5.25 

8.25 

4.50  to  6.00 

4.50 
6.00 

6 .  00 
7., 50 

9  00 

6.50  to  8.00 

10.00 

0.12  to  2.00 

(Round  38  mm  Diameter) 

4.50 

().()() 

2 .  25  to  4 . 25 

5.25 
6.00 

0 .  75 
7.50 

4.50  to  6.00 

6.50  to  8.00 

7 .  50 

9.00 

0.12  to  2.00 

(Round  19  mm  Diameter) 

5.25 

6.00 

8.25 

2.25  to  4.25 

6.00 

6.75 

9.00 

4.50  to  6.00 

6 .  75 

7 .  50 

9.75 

6.50  to  8.00 

Opifex 

8.25 

9.00 

1 1 .  25 

(Round  19  mm  Diameter,  on  Bodies) 

0.12  to  2.00 

7.50 

8 .  75 

10.00 

2 .  25  to  4 .  25 

8 .  25 

9 .  50 

11.00 

4.50  to  6.00 

9.00 

10  50 

12.00 

6 .  50  to  8 .  00 

Edged 
Cement 

10.00 

11.00 

13.50 

0.12  to  2.00 

(25  X  13  mm) 

3 .  00 

4.25 

7.25 

2.25  to  4.25 

3.50 

4 .  75 

7.75 

4.50  to  6.00 

4.25 

5 .  50 

8.50 

6.50  to  8.00 

5.25 

6. 50 

9. 50 

0.12  to  2.00 

(18  mm  Round) 

6.00 

6 . 7.5 

9.00 

2.25  to  4.25 

6.75 

7 .  50 

9.75 

4.50  to  6.00 

7 .  50 

8 .  25 

10.50 

6.50  to  8.00 

Opifex 

9.00 

9 .  75 

12.00 

(Knife  Edge,  Round  18  mm  Diameter,  on  Bodies) 

0.12  to  2.00 

9 .  00 

10.25 

11.50 

2.25  to  4.25 

9 .  75 

11.00 

12.50 

4.50  to  6.00 

10. 50 

12.00 

13.50 

6  50  to  8  00 

11.50 

12.50 

15.00 

115 


B     A     XT      S     C      II  &  L     O     M     R        /M!2o^.         OPTICAL  COMPANY 


KRYPTOK  BIFOCAL   BLANKS  AND   LENSES 


Flat   Hi.ank 


ToRic  Blank 

KRYPTOKS  are  made  of  two  jiieoes  of  optical  ^lass  of  different  substance 
and  hence  of  different  foci,  or  "strenoth,"  fused  into  a  sino;le  piece 
of  olass  and  oTountl  as  a  sino-le  lens. 
They  differ  from  tlie  cemented  l>ifocal  in  that  they  have  no  distinct  hue  of 
demarcation  between  the  distance  and  reading  portions.  As  the  two  pieces 
of  glass  are  firmly  fused  together,  they  form  practically  one  solid  piece,  and 
the  possibility  of  falling  apart  or  collecting  of  dirt  in  the  creases,  therefore,  is 
eliminated. 


116 


n    A    XT    sen 


L     O     M     B 


OPTICAL  COMPANY 


PRICES  FOR 
KRYPTOK   BIFOCAL   BLANKS   AND    LENSES 

These  blanks  and  lenses  are  made  under  U.  S.  I'atents  Nos.  (i.'JTJil  and  H7(i  !):5;J   and  sold 
under  terms  and  conditions  established  by  the  Patentees. 


Per  Pair 


Flat    , 
Toric 


Flat    . 
Toric 


Blanks 
Rough 


Blanks 

Piano  or  Sphero  One  Side 


Uncut 


Lenses 

(Finished  on  l)oth  sides) 
Flat 

Piano  or  Sphero 

Cylinder  or  Sphero-Cylinder 

Sphero-Prism 

Cylinder -Prism  or  Sphero-Cylinder  Prism 

Toric 

Piano  or  Sphero 

Cyliniler  or  Sphero-Cylinder 

Sphero-Prism 

Cylinder-Prism  or  Sphero-Cylinder  Prism 


$2.50 
3.50 


3.00 
4.50 


3.50 
4.50 
4.50 
5.25 

5.50 
6.50 
G.50 

7.75 


Edgred 


EdRed 

and 
Drilled 


Minimum 
Retail 
Prices 

Net 


See  also 
extras 


$4.00 
5.00 
5.00 
5.75 

6.00 
7.00 
7.00 
8.25 


$4.25 
5.25 
5.25 
6.00 

6.25 
7.25 
7.25 
8.50 


$8.00 
10.00 
10.00 
12.00 

10.00 
13.00 
13.00 
15.00 


Single  lalanks  or  lenses  half  price  of  pairs. 


EXTRAS  —  Per  pair  to  list  prices 


Colored,  except  Crookes,  Noviol  and 
Euphos 

Crookes,  Noviol  and  Euphos  .... 

Larger  than  can  be  made  from  regular 
size  blanks 

Flat  blanks  with  minus  or  plus  curve 
greater  than  4.00  D 


Blanks  thicker  than  7  mm $1 .  00 

^1.50    Cataracts  (8.50  to  20.00  D)                 .  1.50 

2.50    Larger  Segments  than  standar<l  size   .  1.00 

Toric  blanks  with  segments  fused  on 

1 .  50         inner  curve  (applies  to  torics  only) .  1 .  00 


1.00 


Single  lenses  half  price. 


SURFACING    OF    KRYPTOK    BLANKS  — Per  pair 


Flats 


Torics 


Piano  or  Sphero  one  side 

Piano  or  Sphero  both  sides 

Cylinder,  Sphero-Cylinder  or  Sphero-Prisms 
Cylinder -Prisms  or  Sphero-Cylinder  Prisms 


$0.50 
1.00 
2.00 
2.75 


$1.00 
2.00 
3.00 
4.25 


EXTRAS  —  Per  pair  to  minimum  retail  prices 


Colored,  except  Crookes,  Noviol  and  Euphos   .    . 

Crookes,  Noviol  and  Euphos 

Larger  than  can  be  made  from  regular  size  blank 

Cataracts  (8.50  to  20.00  D)     . 

Larger  segments  than  standard  size 


$1.50 
2.50 
2.00 
2.00 
1.00 


Single  lenses  half  price. 


117 


BAUSCII  <fc  LOME       /®^^       OPTICAL  COM     PANT 


BAUSCH   &   LOMB   KRYPTOK   CHART 


FLAT  BLANKS 


Curves 

READING 

ADDITIONS 

Side 

0.50 

0.62 

0.75 

0.87 

.00 

1.12 

1.25  1.37 

1.50 

1.62 

1.75 

1.87 

2.00 

2.12 

2.25 

2.37 

2.50 

2.62 

2.75 

2.87 

3.00 

3.12 

3.25 

3.37 

3.50 

3.62 

3.75 

3.87 

4.00  4.25 

4.50 

Piano 

10 

13 

16 

19 

21 

24 

26 

29 

32 

35 
34 
34 

37 
36 
36 

40 
39 
39 

43 
42 

42 

45 
45 
44 

48 

47 
47 

50 
50 
49 

53 
52 
52 

56 
55 
55 

59 
58 
58 

61 
61 
60 

65 
65 
64 

G8 
68 
67 

70 
70 
69 

72 
72 
71 

75 
75 
74 

91 
91 
90 

93 
93 
92 

94 
94 
93 

95 
95 
94 

98 
98 
97 

101 

+  0.12 
+  0.25 

10 
9 

13 

12 

IG 
15 

18 
}8 

20 
20 

23 
23 

25 
25 

28 
28 

31 
31 

101 
100 

+  0.37 

9 

12 

15 

17 

19 

22 

24 

27 

30 

33 

35 

38 

41 

44 

46 

49 

51 

54 

57 

60 

64 

67 

69 

71 

74 

90 

92 

93 

94  97 

100 

+  0.50 

8 

11 

14 

17 

19 

22 

24 

27 

30 

33 

35 

38 

41 

43 

46 

48 

51 

54 

57 

59 

63 

66 

68 

70 

73 

89 

91 

92 

93  96 

99 

+  0.62 

8 

7 

11 
10 

14 

16 

18 

21 

23 

26 

29 

32 

34 

37 

40 

43 

45 

48 

50 

53 

56 

59 

63 

66 

68 

70 

73 

89 

91 

92 

93-  P6 

99 

+  0.75 
+  0  87 

13 

16 

18 

21 

23 

26 

29 

32 

34 

37 

40 

42 

45 

47 

50 

53 

56 

58 

62 

65 

67 

69 

72 

88 

90 

91 

92 

95 

98 

+  1.00 
+  1.12 
+  1.25 
+  1..37 

6 
5 

9 

8 

12 
11 

15 
14 

17 
16 

20 
19 

22 
21 

25 
24 

28 
27 

31 
30 

33 
32 

36 
35 

39 
38 

41 

40 

44 
43 

46 
45 
44 

49 

48 
47 

52 
51 
50 

55 
54 
53 

57 
56 
55 

61 
60 
59 

64 
63 
62 

66 
65 
64 

68 
67 
66 

71 
70 
69 

74 
73 

72 

89 
88 
74 

90 
89 

88 

91 
90 

94 
93 

97 
96 

+  1.50 
+  1.62 

4 

7 

10 

13 

15 

18 

20 

23 

26 

29 

31 

34 

37 

39 

42 

89^  92 

95 

+  1.75 
+  1.87 

3 

6 

9 

12 

14 

17 

19 

22 

25 

28 

30 

33 

36 

38 

41 

43 

46 

49 

52 

54 

58 

61 

63 

65 

68 

71 

73 

74 

88  91 

94 

+  2.00 
+  212 

2 

5 

8 

11 

13 

16 

18 

21 

24 

27 

29 

32 

35 

37 

40 

42 

45 

48 

51 

53 

57 

60 

62 

64 

67 

70 

72 

73 

87 

90 

93 

+  2.25 
+  2.37 

1 

4 

7 

10 

12 

15 

17 

20 

23 

26 

28 

31 

34 

36 

39 

41 

44 

47 

i50 

52 

56 

59 

61 

63 

66 

69 

71 

72 

86 

89 

92 

+  2.50 
+  2  62 

6 

9 

11 

14 

16 

19 

22 

25 

27 

30 

33 

35 

38 

40 

43 

46 

49 

51 

55 

58 

60 

62 

65 

68 

70 
69 

71 

85 

88 

91 

+  275 
+  2,87 

5 

8 

10 

13 

15 

18 

21 

24 

26 

29 

32 

34 

37 

39 

42 

45 

48 

50 

54 

57 

59 

61 

64 

67 

71 

84 

87 

90 

+  3.00 
+  3.12 

7 

9 

12 

14 

17 

20 

23 

25 

28 

31 

33 

36 

38 

41 

44 

47 

49 

53 

56 

58 
57 
56 

60 
59 
58 

63 
62 
61 

66 
65 
64 

68 
67 
GG 

70 
69 
68 

83 

86 

89 

+  3.25 
+  3.37 

8 

11 

13 

16 

19 

22 

24 

27 

30 

32 

35 

37 

40 
39 

43 

42 

46 
45 
44 

48 
47 
46 

52 
51 
50 

55 
54 

74 
73 

85 
84 

88 

+  3.50 
+  3.62 

12 

15 

18 

21 

23 

26 

29 

31 

34 

36 

87 

+  3  75 
+  3.87 

11 

14 

17 

20 

22 

25 

28 

30 

33 

35 

38 

41 

53 

55 

57 

60 

63 

65 

67 

72 

83 

8fi 

-^  4.00 

10 

13 

16 

19 

21 

24 

27 

29 

32 

34 

37 

40 

43 

45 

49 

52 

54 

56 

59 

62 

64 

66 

71 

82 

85 

+  4.25 

12 

15 

18 

20 

23 

26 
25 

28 

27 

31 
30 

33 
32 

36 
"35 

.38 

42 
41 

44 
43 

48 
47 

51 

50 

53 
52 

55 
54 

58 
57 

61 
60 

63 
62 

65 
64 

70 
69 

81 

75 

84 

+  4.50 

11 

14 

17 

19 

22 

83 

-  0.12 

-  0.25 

11 

14 

17 

20 

22 

25 

27 

30 

33 

36 

38 

41 

44 

46 

49 

51 

54 

57 

60 

63 

66 

69 

71 

73 

90 

92 

93 
94 

95 
96 

96 
97 

99  102 

—  0.37 

—  0.50 

12 

15 

18 

21 

23 

26 

28 

31 

34 

37 

39 

42 

45 

47 

50 

52 

55 

58 

61 

64 

67 

70 

72 

74 

91 

93 

100 

103 

—  0.62 

-  0.75 

13 

16 

19 

22 

24 

27 

29 

32 

35 

38 

40 

43 

46 

48 

51 

53 

56 

59 

62 

65 

68 

71 

73 

75 

92 

94 

95 

97 

98 

101 

104 

-  0.87 

-  1.00 

14 

17 

20 

23 

25 

28 

30 

33 

36 

39 

41 

44 

47 

49 

52 

54 

57 

60 

63 

66 

69 

72 

74 

92 
93 

93 
94 

95 
96 

96 
97 

98 
9f) 

99 
100 

102 
103 

105 

-  1.12 

-  1.25 

15 

18 

21 

24 

26 

29 

31 

34 

37 

40 

42 

45 

48 

50 

53 

55 

58 

61 

64 

67 

70 

73 

75 

106 

-  137 

-  1.50 

16 

19 

22 

25 

27 

30 

32 

35 

38 

41 

43 

46 

49 

51 

54 

56 

59 

62 

65 

68 

71 

74 

92 

94 

95 

97 

98 

100 

101 

104 

107 

—  1.62 

—  1.75 

-^    187 

—  2.00 

17 
418 
419 
420 
421 

20 
421 
422 

23 
424 
425 

26 

427 
428 

28 
429 
430 

31 
432 
433 

33 
434 

'435 

36 
437 

39 

440 

42 
443 
444 

44 
445 

47 
448 

50 
451 
452 

52 
453 
454 

55 

456 
457 

57 
458 
.459 

60 
461 
462 

63 
4G4 
465 

66 
467 
468 

69 
470 
471 

72 
473 
474 

75 
492 

93 
494 

95 
496 

96 
497 

98 
499 

99 
500 

101 
502 

102 
503 

105 
506 

108 
509 

—  2.12 

-  225 

438  441 

446*449 

493 

495 

497'498 

500 

501 

503 

504 

507 

510 

—  2.37 

—  2.50 

—  2.62 

—  2.75 

423 
424 

426 
427 

429 
430 

431 

432 

434' 436 
435437 

439*442 
440  443 

445 
446 

447  450 

448  451 

453 
454 

455 
456 

458 
459 

460 
461 

463 
464 

466 
467 

469 
470 

472 
473 

475 
494 

494 
495 

496 
497 

498499 
499|500 

501 
502 

502 
503 

504 
505 

505 
506 

508 
509 

511 
518 

—  2.87 

—  3.00 

422 
423 

425 
426 

428 
42!) 

431 

433 

436438 

441  444 

447 

449  452 

455 

457 

460 

462 

465  468 

471 

474 

495 

490 

498 

500 

501 

503 

504 

506 

507 

510 

513 

—  3.25 

432 

434 

437'439  442  445 

448 

450  453  456 

458 

461 

463 

466 

469 

472 

475 

496 

497 

499 

501 

502 

504 

505 

507 

508 

511 

514 

—  3.50 

424 

427 

430 

433 

435 

438  440  443  440  449451  454*457 

459 

462 

464 

467 

470 

473 

495 

497 

498 

500 

502 

503 

505 

506 

508 

509 

512 

515 

—  3.75 

m 

428 

431 

434 

430 

435 

441  444  447'450  452  455  458 

460 

463 

465 

468 

471 

473 

496 

498 

499 

501 

503 

504 

506 

507 

509 

510 

513 

516 

—  4.00 

B2( 

62S 

639 

63.. 

63' 

640 

642  645G48  651j653 

656 

659 

661 

664 

666 

669 

672 

696 

697 

699 

700 

702 

704 

705 

707 

708 

710 

711 

714 

717 

—  4.25 

62- 

63f 

633' 636 

636 

64 

643 

64t 

649^654 

654 

657 

G60 

662 

665 

667 

670 

673 

697 

698 

700 

701 

703 

705 

706 

708 

709 

711 

712 

715 

718 

—  4.50 

62f 

631 

634637 

63S 

644 

644 

G4- 

65C 

653 

65i 

658 

661 

663 

666 

668 

671 

674 

698 

699 

701 

702 

704 

706 

70- 

709 
710 

710 
711 

712 
713 

713 
714 

716 
717 

719 

—  4.75 

G2£ 

GSii 

635  638 

640643[64; 

646 

65] 

654 

65C 

,659 

662 

664 

667 

669 

672 

675 

699 

700 

702 

703 

705 

707 

706 

720 

—  5.00 

W 

635 

636  639 

641  644  64( 

64! 

65i 

G5; 

65- 

660 

663 

665 

668 

670 

673 

676 

700 

701 

703 

704 

706 

708 

70£ 

711 

712 

714 

715 

718 

721 

Curves 

on  Disc 

Side 

4  So|o.63 

0.75  0.87 

1.00  1.12  1.2. 

1.37{l.5( 

1.6! 

1.7 

J  1.87 

2.00 

2.12 

2.25 

2.37 

2.50 

2.62 

2.75 

2.87 

3.00 

3.12 

3.25 

3.37 

3.5( 

3.62 

3.75 

3.87 

4.00 

4.25 

4.50 

READING  ADDITIONS 

This  chart,  printed  on  heavy  cardboard  for  shop  use,  will  be  mailed  free  on  request 


118 


^'     A  y      S  C   H     &     L  O  M   B  /^^^       O     I'  T  I  C  A  L    Co  M  1'  A  \  Y 


BAUSCH   &   LOMB   KRYPTOK  CHART 


TORIG 

BLANKS 

Curves 

READING  ADDITIONS 

Side 

0.50 

0.62 

0.75 

0.87  1.00 

1.12 

1.25 

1.37( 

1.50  1  1.62  1.75 

1.87  2.00]  2.12 

2.25 

2.37 

2.50 

2.62 

2.75  2  87  1  3.00 

3.12  3.25  3.37  3.50  3.75  4.00 

+  300 
+  3.12 

^m 

215 

218 

221  223 

226 

228 

231 

234  236 

239 

242  245  247 

250 

252 

255 

258 

261  264  267 

269  271  274  277 

28  ll  287 
'>'.S(I  2S6 
279,  285 

+  3  37 

•.>ii 

214 

217 

220 

222 

225 

227 

230 

233 

235 

238 

241 

244  246 

249 

251 

254 
253 

257 
256 

261/  'j(;:i  -.'ik;  -.mis  -.'Tij^  -j?:'.  'J7( 

+  3.50 
+  3.62 

iio 

2.3 

216 

219 

221 

224 

226 

229 

232 

234 

237 

240 

243 

245 

248 

250 

2.V1  -i:;   ■•(,.-,  ..,17 

209  272 

275 

+  3.75 
+  3.87 

iOO 

212 

215 

218 

220 

223 

225 

228 

231 

233  236 

239 

242 

244 

247 

249 

iSS 

255 

2.".s  _'(;i  -ji;).  J(16 

268]  271 

274 
273 
272 
271 
270 
269 

278 

284 

+  4  00 
+  4.12 

208 

211 

214 

217 

219 

222 

224 

227 

230 

232  235 

238 

241 

243 

246 

248 

251 

254 

257 

26(1 

263 

265 

267  270 
266  269 
265  268 
264  267 
263  266 

277 
276 
275 
274 
273 

283 

4  4.25 
+  4.37 

-iO~ 

210 

213 

216 

218 

221 

223 

226 

229 

231  234 

237 

240 

242 

245 

247 

250 

253 

256 

259 

262 

264 

282 

+  4.50 

+  4  62 

206 

209 

212 

215 

217 

220 

222 

225 

228 

230  233 

236 

239 

241 

244 

246 

249 

252 

255 

258 

261 

263 

281 

+  4  75 
+  4  87 

i>OJ 

208 

211 

214 

216 

219 

221 

224 

227 

229 

232 

235 

238 

240 

243 

245 

248 

251 

254 

257 

260 

262 
261 

280 

+  5.00 
+  5.12 

204 

207 

210 

213 

215 

218 

220 

223 

226 

228 

231 

234 

237 

239 

242 

244 

247 

250 

253 

256 

259 

279 

+  5.25 
+  5.37 

203 

206 

209 

212 

214 

217 

219 

222 

225 

227 

230 

233 

230 

238 

241 

243 

246 

249 

252 

255 

258 

266 

262 

265 

268 

272 

278 

+  5.50 
+  5.62 

202 

205 

208 

211 

213 

216 

218 

221 

224 

226 

229 

232 

235 

237 

240 

242 

245 

248 

251 

254 

257 

259 

261 

264 

267 

271  277 

+  5.75 
+  5.87 

312  315  318  320 

323 

325 

328  331 

334 

336 

339  342 

345 

347 

350 

352 

355 

358 

361 

363 

366  368 

371 

374 

377 

382  387 

+  6.00 
+  612 

3n|  314  317i  319 

322 

324 

327  330 

333 

335 

338  341 

344 

346 

349 

351 

354 

357 

360 

362 

365  367 

370 

373 

376 

381  386 

+  6.25 
+  6  37 

310  313  3;6'  318 

321 

323 

326  329 

332 

334 

337  340 

343 

345 

348 

350 

353 

356 

359 

361 

364  366 

369 

372 

375 

380]  385 

+  6  50 
+  6.62 

309  312  315|  817 

320 

322 

325  328 

331 

333 

336 

339 

342 

3441  347  349  352 

355 

-358 

360 

363j  365  368 

371  374 

379  384 

+  6.75 
+  6.87 

308  311  314  316 

319 

321 

324  327 

330 

332 

335 

338 

341 

343  346]  348  351 

354 

357 

359 

362  364  367 

370'  373 

378 

383 

+  7.00 
+  7.12 

307 

310  313  315  318 

320 

323  326;  329 

331 

334 

337 

340 

342'  345  347  350  353 

356 

358 

361  363 

366 

369'  372 

377 

382 

+  7.25 
+  7.37 

306 

309 

312  314  317 

319 

322  325|  328 

330 

333 

330 

339  341  344  346^  349  352 

355 

357 

360  362 

365 

368  371 

376 

381 

+  7  50 
+  7.62 

305 

308 

311  313  316 

318 

321 

324 

327 

329 

332 

335 

338  340[  343 

345  348  351 

354 

356 

359 

361 

364 

367  370 

375,  380 

+  7,75 
+  7.87 

304 

307 

310  312  315 

317 

320 

323 

326 

328 

331 

334 

337  339  342 

344  347  350 

353 

355 

358 

360 

363 

366J  369 

374  379 

+  8.00 
+  8  12 

303 

306 

309  311  314 

316 

319 

322 

325 

327 

330 

333  336  338|  341 

343  346  349 

352 

354 

357 

359 

362 

365  368 

373  378 

+  8.25 
+  8.37 

302 

305  308  310  313 

315 

318 

321 

324 

326 
325 

329 

332  335  337  340  342  345  348 

351 

353 

356 

358 

361 

364  367 

372  377 

+  8.50 
+  8  62 

301 

304  307  309  312 

314 

317 

320 

323 

328 

33l[  334  336  339  341  344  347 

350 

352 

355  357 

360 

363'  366 

371 

376 
375 

+  8.75 
+  8.87 

300 

303'  306!  308  311 

313 

316 

319  322  324 

327  330  333'  335  338  340  343  346 

349 

351 

354|  356 

359 

362]  365 

370 

+  9.00 
+  9.12 

802 

805 

807 

810 

812 

815 

818 

821 

823 

826 

849  832 

834  837 

839 

842 

845 

848 

850 

853 

855 

858 

861  864 

869  874 

+  9.25 
+  9.37 

801 

804 

806 

809 

811 

814 

817 

820 

822 

825 

828  831 

833  830 

838 

841 

844 

847 

849 

852 

854 

857 

860|  8(53 

868 

873 

+  9  50 
+  9.62 

800 

803 

805 

808 

810 

813 

816 

819 

821 

824 

827  830  832J  835 

837 

840 

843 

846 

848 

851 

853 

856 

859 

862 

867 

872 

+  9.75 
+  9.87 

802 

804 

807 

809  812 

815 

818 

820 

823 

826'  829  831  834 

836 

839 

842 

845 

847 

850 

852 

855 

858 

861 

866 

871 

+  10  00 
+  10.12 

801 

803 

806 

808  811 

814 

817 

819 

822 

825 

828 

830 

833 

835 

838 

841 

844 

846 

849 

851 

854 

857 

860 
859 

■865 
864 

870 

+  10.25 
+  10.37 

800 

802 

805 

807  810 

813 

816 

818 

821 

824 

827 

829 

832 

834 

837 

840 

843 

845 

848 

850 

853 

856 

869 

+  10.50 
+  10  62 

'. .. 

801 

804 

806  809 

812 

815 

817 

820 

823 

826 

828 

831 

833 

836 

839 

842 

844!  847 

849 

852 

855 

858 

863 

868 

+  10.75 
+  10.87 

... 

800 

803 

805  808 

811 

814 

816 

819 

822 

825 

827 

830 

832 

835 

838 

841 

843  846 

848 

851 
850 

854 
853 

857 
856 

862 
861 

867 

+  11.00 
+  11.12 

802 

804  807 

810 

813 

815 

818 

821 

824 

826 

829 

831 

834 

837 

840 

842  845 

847 

866 

+  11.25 
+  1137 

801 

803 

806 

809 

812 

814 

817 

820 

823 

825 

828 

830 

833 

836 

839 

841 

844 

846 

849 

852 

855 
854 

860 
859 

865 

+  11.50 
+  11.62 

800 

802 

805 

808 

811 

813 

816 

819 

822 

824 

827 

829 

832 

835 

838 

840 

843 

845 

848 

851 

864 

+  1175 
+  11.87 

801 

804 

807 

810 

812 

815 

818 

821 

823 

826 

828 

831 

834 

837 

839 

842 

844 

847 

850 

853 

858 

863 

+  12  00 
+  12.12 

800 

803 

806 

809 

811 

814 

817 

820 

822 

825 

827 

830 

833 

836 

838 

841 

843 

846 

849|  852 

857 

868 

+  12.25 
+  12.37 

802 

805 

808 

810 

813 

816 

819 

821 

824 

826 

825 

829 

832 

835 

837 

840 

842 

845 

848]  851 

856 

861 

+  12.50 
+  12.62 

801 

804 

807 

809 

812 

815 

818 

820 

823 

828 

831 

834 

836  839 

841 

844 

847]  850 

855 

860 

+  12.75 

800 

803 

806 

808 

811 

814 

817 

819 

822 

824  827 

830 

833 

835  838 

840 

843 

846'  849 

854 

859 

+  13.00 

802 

805  807 

810 

813 

816 

818 

821 

8231  826 

829 

832 

834 

837 

839 

842  845  848 

853 

858 

+  1325 

804 

806 

809 

812 

815 

817 

820 

822 

825 

828 

831 

833 

836 

838 

84l|  844!  847 

852 

857 

Curves 

0  50 

0.62 

0.75  0.87 

1.00 

1.12 

125 

1.37 

1.50 

162 

1.75 

1.87  2  00 

2.12 

2.25 

2.37 

2.50 

2.62  1  2.75 

2.87 

3.00 

3.12  '  3.25 1  3.37  ^  3.50 

3.75 1 4.00 

Side 

READING  ADDITIONS 

This  chart,  printed  on  heavy  cardboard  lor  shop  use,  will  be  mailed  free  on  request 


119 


B     A     U      S     C      FT  &  L     O     M      R       /CS^^lSSx        OPTICAL  COM     P    A    N    Y 


KRYPTOK  BIFOCAL  DIRECTIONS 

The  followin<>;  directions  will  be  found  useful  in  selecting  and  surfacing 
blanks : 

Selection  of  Blank — First  determine  form  and  curves  of  the  lens  required 
and  proceed  to  find  blank  number  in  the  following  manner: 

Trace  down  the  "disc  side"  column  of  the  chart  to  the  desired  curve, 
then  across  the  top  line  to  the  desired  reading  addition;    the  figure 
in  the  intersecting  space  will  indicate  the  number  of  blank  to  be 
used.     This  can  be  readily  verified  in  the  following  examples,  all  of 
which  have  +1.00  additions: 
+  1.00  Sph.  in  Piano-Convex  form  (disc  on  piano  side)  Blank  No.  21. 
+  1.00  Sph.  in  Piano-Convex  form  (disc  on  +1.00  side)  Blank  No.  17. 
+  1.00  Sph.  in  Periscopic  form  (disc  on  —1.25  side)  Blank  No.  26. 
+  1.00  Sph.  in  Periscopic  form  (disc  on  +2.25  side)  Blank  No.  12. 
+  1.00  S})h.  in  Meniscus  form -6.00  Curve  (disc  on  +7.00  curve)  Blank 

No.  318. 
+  1.00  Plano-Cyl.  in  flat  form  (disc  on  piano  side)  Blank  No.  21. 
Surfacimj — Always  grind  the  disc  side  first. 

Blocking — Both  the  blank,  as  well  as  the  l)0(ly  on  which  it  is  to  be  blocked, 
should  be  heatetl  and  blocking  wax  aj)plied  to  each,  then  glass  pressed  onto 
body  while  wax  is  still  warm.  The  glass  should  be  gradually  and  uniformly 
heated  and  on  no  account  put  into  direct  flame  of  the  gas.  It  should  be  given 
time  to  cool  before  grinding  and  never  cooled  by  dipping  into  water. 
Roughing — Coarse  emery  may  be  used  safely  as  follows : 

From  Nos.  1  to  10  until  disc  is  6.5  mm  larger  than  finished  size. 
From  Nos.  11  to  40  until  disc  is  5.0  mm  larger  than  finished  size. 
From  Nos.  41  up  until  disc  is  3.0  mm  larger  than  finished  size. 
The  weaker  the  addition,  the  more  rapidly  will  the  size  of  disc  be  reduced 
when  smoothing. 
Smoothing    -^Qcond  emery  may  be  used  as  follows: 

From  Nos.  1  to  10  until  disc  is  3.5  mm  larger  than  finished  size. 
From  Nos.  11  to  40  until  disc  is  3.0  mm  larger  than  finished  size. 
From  Nos.  41  up  until  disc  is  2.0  mm  larger  than  finished  size. 
Fine  Grinding— Hausch  &  Lomb  fine  emery  should  be  used  and  the  disc 
left  0.5  mm  larger  than  finished  size,  as  polishing  will  reduce  it  that  much. 

Polishing — Use  Bausch  &  Lomb  rouge  and  either  piano  felt  or  a  closely 
woven  cloth.  It  is  better  not  to  try  to  force  the  work,  })ut  to  polish  slowly. 
Better  work  will  be  obtained  by  so  doing. 

Taking  Glass  off"  Body — Do  not  take  off  by  jarring,  preferably  let  cold  water 

120 


B     A     U      S     C      II 


L     O      M      13 


O     P    T    1    C    A    L 


<)    M     I'    A    N    V 


run  over  the  hack  of  Ixxly,  thorehy  chillini;-  il.  In  a  few  inoiiicrils  the  i)if(h 
will  contract  and  the  Umis  can  he  reaiMh   sepaialed  tVoni  il. 

Surfacing  Second  Sidc^Vsc  Hie  same  care  in  hiockinn'  as  on  the  first  side. 
If  lens  is  to  he  ground  to  a  cylinder  or  loric-  surface,  indicate  the  axis  on  the 
finished  side  by  marking  a  line  with  hhie  wax  pencil. 

Avoid  Prismatic  Effccf^lMcrnuuv  height  the  disc  is  to  he  when  lens  is 
edged,  and  after  allowing  sufficient  margin,  cut  away  sur])lus  glass  on  both 
upper  and  lower  portions  of  blank.  The  body  to  l)e  used  should  confoini 
nearly  in  curve  to  that  of  the  curve  of  blank  to  he  blocked  on  it.  'J  his  lule 
holds  good  whether  for  first  or  second  side.  Do  not  block  a  loric  Kryplok  on 
a  flat  body,  or  vice  versa,  as  an  undue  strain  will  be  put  on  the  lens.  Do  not 
grind  into  the  disc  when  grinding  the  second  side.  It  can  be  avoided  by  fol- 
lowing the  table  given  Ijclow.  This  table  will  show  what  the  actual  thickness 
of  the  flint  disc  should  be  at  its  center,  plus  a  small  margin  for  safe  grinding. 
If  the  lens  is  ground  thinner  at  this  point,  the  blank  will  be  ruined  by  grinding 
into  the  disc. 


Addition 

Minimum 
Ttiickness 

Addition 

Minimum 
Thiclcness 

Addition 

Minimum 
Thickness 

0.50 

0.4  mm 

1.62 

0.9  mm 

2.62 

1 . 3  mm 

0.62 

0.5  mm 

1.75 

1 . 0  mm 

2 .  75 

1 . 4  mm 

0.75 

0.5  mm 

1.87 

1 . 0  mm 

2.87 

1 . 5  mm 

0.87 

0.6  mm 

2.00 

1 . 1  mm 

3 .  00 

1 . 5  mm 

1.00 

0 . 6  mm 

2.12 

1 . 1  mm 

3.25 

1 . 6  mm 

l.U 

0.7  mm 

2 .  25 

1 . 2  mm 

3.50 

1 . 7  mm 

1.25 

0.7  mm 

2.37 

1 . 2  mm 

3.75 

1 . 8  mm 

1.37 

0.8  mm 

2.50 

1 . 3  mm 

4.00 

1 . 9  mm 

1.50 

0.8  mm 

This  scale  is  computed  for  18  mm  discs.  If  the  disc  is  to  be  left  larger 
than  18  mm  diameter,  the  lens  should  be  left  thicker  at  that  point. 

If  discs  are  to  "set  in"  for  reading,  proceed  as  follows:  Before  marking 
lens  for  axis  and  before  surfacing  cylinder  side,  rotate  the  lens  5°  for  each 
millimeter  it  is  to  be  set  in. 

If  lens  is  for  Right  eye,  rotate  disc  toward  left. 

If  lens  is  for  Left  eye,  rotate  disc  toward  right. 

Then  mark  the  axis  on  the  side  upon  which  the  cylinder  surface  is  to  be 
ground  in  the  usual  manner,  using  protractor.  Turn  lens  over  and  mark 
again  on  finished  disc  side  in  wax  pencil,  tracing  over  the  mark  shown  on  the 
side  to  be  oround. 


121 


ULTEX    ONEPIECE 
BIFOCAL    BLANKS    AND    LENSES 

"UNI-BIFO    (LUXE)" 

(Registered  Trade  Mark) 


ULTEX   Onepiece  Bifocal   Lenses  show   no   marked   line  of  separation 
between  the  distance  and  reading  portions.     They  are  single,  solid 
lenses,  althou<rh  ground  with  two  foci.     Being  of  a  single  piece  of 
glass,  they  are  free  from  disturl)ing  color  effects. 

Every  Ultex  bifocal  lens  of  our  manufacture  has  engraved  upon  its  inner 
surface  near  the  right  central  margin  our  trade  mark,  (g).  While  this  engrav- 
mg  can  only  be  seen  with  the  aid  of  a  magnifying  glass,  it  is  important — 
guaranteeing  the  lens  to  be  made  with  the  same  scientific  accuracy  and  care 
as  all  Bausch  &  Lomb  ophthalmic  lenses. 

12^2 


B     A     V      sen            &            L     O     M     B       /@2o»\        OPTIC    A    L  COMPANY 

. fi/^ 


This  new  onej)UHv  bifocal  is  juslly  considered  one  of  llie  greatest  lriMnii)lis 
yet  achieved  in  the  development  of  ophllialmic  lenses  for  donhle  vision. 
Its  introduction  has  marked  a  new  era  in  refraction  work.  Combining  in  a 
single  lens  the  functional  properties  of  the  old  cemented  bifocals,  it  is  marked 
by  an  ingenuity  of  workmanship  and,  with  the  accurate  simplicity  of  its 
optical  detail,  removes  practically  all  of  the  objections  which  were  ever  raised 
against  the  use  of  bifocals  generallv. 

The  Ultex  Onepiece  is  made  by  grinding  in  the  lower  portion  of  the  lens  a 
different  focus  for  reading,  and  is  as  light  and  graceful  a  bifocal  as  there  is 
on  the  market.  It  can  be  made  to  fill  practically  any  conceivable  prescrip- 
tion in  plus  and  minus  combinations,  combined  with  cylinders  on  both  por- 
tions of  the  lens,  or  on  that  of  the  distance  vision  only,  and  with  any  prismatic 
effect  desired.  This  high  precision  work  is  only  rendered  possible  by  the 
use  of  the  most  perfectly  constructed  machines  and  accessories,  in  which  the 
permissible  error  is  reduced  to  a  mininumi. 


All  Ultex  bifocal  lenses  of  our  manufacture  are  marketed  under  the  regis- 
tered trade  mark  of  "Uni-Bifo  (Luxe)."  Their  function  is  indicated  by  the 
accompanying  illustration,  which  lias  been  quite  widely  used  in  connection 
with  our  Ultex  publicity.  Although  showing  no  sharp  line  of  demarcation  in 
the  lens  itself,  it  gives  a  miniature  view  of  our  main-factory  through  the  dis- 
tance portion  and  ordinary  type  matter  through  the  reading  portion. 

On  pages  l'-28  and  129  will  be  found  directions  for  selecting  and  surfacing 
Ultex  Onepiece  blanks.  A  careful  study  of  these  directions  is  strongly  recom- 
mended, particularly  as  to  surfacing,  as  the  grinding  of  these  blanks  requires 
more  than  ordinary  care,  and  the  exj:»ense  resulting  from  unnecessary  loss  of 
time  and  material  mav  thus  be  eliminated. 


B     A     TT      S     C     H 


L     O     M      B 


OPTICAL  COMPANY 


PRICES   FOR  ULTEX   ONEPIECE 

BIFOCAL  BLANKS  AND  LENSES 

"UNI-BIFO   (LUXE)" 

(Registered  Trade  Mark) 

SUPPLIED   IN   TORIC   FORM   ONLY 

(  B.    Blank  -17  mm  Round.     Readintj;  Portion  1!)  mm. 
Regular  Sizes  |  y     ^^^^^^^  ^g  ^  gg  ^^^^^^      Reading  Portion  30  x  about  1.5  nmi. 

Large  Size  E.    Rlank  55  x  47  mm.     Reading  Portion  30  x  about  21  nmi. 

These  len.ses  are  made  under  U.  S.  Patents  Nos.  836,480;   925,80'^;    932,905;    954,772  and 
946,571  and  sold  under  terms  and  conditions  established  by  the  Patentees. 


Per  Pair 


Blanks 

(Bifocal  Side  Finished) 
Regular  Sizes    .    .    . 
Sizes    larger    than 

Regular 

Combinations  not  on 

Chart 

Sphero 

(Finished  on  Both  Sides) 
Regular  Sizes    .    .    . 
Sizes   larger    than 

Regular 

Combinations  not  on 

Chart 

Cylinder  and 
Sphero-Cy  Under 

(Finished  on  Both  Sides) 
Regular  Sizes    .    .    . 
Sizes    larger   than 

Regular 

Combinations  not  on 

Chart 

Single  Blanks  and 
Lenses,  Half  Price 
of  Pairs 


E  STYLE 


Trade  List  Prices 


Blanks 


$  7.50 
15.00 
15.00 


Finished  Both  Sides 


Uncut    Edged 


$  8.50 
16.00 
16.00 

8.50 
16.00 
16.00 


$  9.00 
16.50 
16.50 

9.00 
16.50 
16.50 


Retail 
Prices 

Edged       Ngt 
and 

Drilled 


B  STYLE 


Trade  List  Prices 


Finished  Both  Sides 


Blanks 


i  9.25 
16.75 
16.75 

9.25 
16.75 
16.75 


$15.00 
22 .  50 
22.50 

15.00 
22.50 
22.50 


$  7.50 
15,00 
15.00 


Uncut    Edged 


$  8,50 
16.00 
16.00 

8.50 
16.00 
16.00 


if!  9.00 
1(J.50 
16.50 

9.00 
16.50 
16.50 


Edged 

and 
Drilled 


$  9.25 
16.75 
16.75 

9.25 
16.75 
16.75 


Retail 
Prices 

Net 


$15.00 
22 .  50 
22.50 

15.00 
22.50 
22.50 


EXTRA 


Per  Pair 


For  Standard  Shade,  colored  lenses,  except  Crookes,  Noviol  and  Euphos 
For  Standard  Shade,  colored  lenses,  Crookes,  Noviol  and  Eujihos  .  .  . 
For  Reading  Additions  stronger  than  4.50  D 


$2.00 
3.00 
1.50 


124 


15     A     U      S      C 


L      O      M      H 


()     V    T    I    (•    A     L 


(•    ()    M     I'    A    N    Y 


ULTEX   ONEPIECE   BIFOCAL  CHART 

OUH  c-liart  is  hased  on  llir  "Four  Curve"  plan,  as  shown  Ix-low,  cij^lity 
blanks  const itutini^'  a  (•oinj)lcU*  assorlincnt  in  llic  <;iv('n  diopters. 
While  a  somewhat  larger  ecjuipnienl  of  tools  is  thus  necessary  than 
would  be  the  case  with  a  sin<;le  base  curve  system,  the  slock  of  blanks  required 
involves  a  decidedly  smaller  investment. 

TABLE   OF   BLANK   NUMBERS 


Sphero 

Inner 
Curve 

READING  ADDITIONS 

Distance 
Power 

0.50 

0.75 

0.87 

1.00 

1.12 

1.25 

1.37 

0.00  to  +2.00 

-6.00 

1014 

1016 

1017 

1018 

1019 

1020 

1021 

+  2.25  to  +4.00 

-4.00 

2614 

2616 

2617 

2618 

2619 

2620 

2621 

-0.12  to  -LOO 

-6.00 

1014 

1016 

1017 

1018 

1019 

1020 

1021 

-L12to  -3.00 

-8.00 

12614 

12616 

12617 

12618 

12619 

12620 

12621 

-3.25  to  -4.00 

-9.00 

13414 

13416 

13417 

13418 

13419 

13420 

13421 

Sphero 

Inner 
Curve 

READING  ADDITIONS 

Distance 
Powder 

1.50 

1.75 

2.00 

2.25 

2.50 

2.75 

3.00 

0.00  to  +2.00 

-6.00 

1022 

1024 

1026 

1028 

1030 

1032 

1034 

+  2.25  to  +4.00 

-4.00 

2622 

2624 

2626 

2628 

2630 

2632 

2634 

-0.12  to  -1.00 

-6.00 

1022 

1024 

1026 

1028 

1030 

1032 

1034 

-1.12  to  -3.00 

-8.00 

12622 

12624 

12626 

12628 

12630 

12632 

12634 

-3.25  to  -4.00 

-9.00 

13422 

13424 

13426 

13428 

13430 

13432 

13434 

Sphere 

Inner 
Curve 

READING  ADDITIONS 

Distance 
Power 

3.25 

3.50 

3.75 

4.00 

4.23 

4.50 

-0.00  to  +2.00 

-6.00 

1036 

1038 

1040 

1042 

1044 

1046 

+  2.25  to  +4.00 

1   -4.00 

2636 

2638 

2640 

2642 

2644 

2646 

-0.12  to  -1.00 

\     -6.00 

1036 

1038 

1040 

1042 

1044 

1046 

-L12to  -3.00 

-8.00 

12636 

12638 

12640 

12642 

12644 

12646 

-3.25  to  -4.00 

-9.00 

13436 

13438 

13440 

13442 

13444 

13446 

125 


B    A     V     s     r 


LOME 


OPTICAL 


COMPANY 


ULTEX  ONEPIECE   BIFOCAL  TABLE   OF 
SURFACING   TOOLS 

The  tal)k'  on  tlii.s  ami  tlic  oppasite  \rd^e  is  based  on  the  "Four  C'lU've"  plan,  in  which 
eighty  blanks  complete  the  entire  range  of  focus  combinations;  it  is  designed  to  afford  an  easy 
method  of  selecting  curves  to  surface  a  given  distance  result.  The  left-hand  column  shows 
the  distance  powers;  the  colunms  to  the  right  give  the  cylinder  powers,  the  heavy  face  figin-es 
in  the  intersecting  spaces  indicating  the  inner  curve  of  distance  portion  of  blank. 


DISTANCE 
POWER 

+  CYLINDER  POWER 

+  Sphero 

Meniscus 

+  .12 

Zooo 

0  6  12 

+  .25 

/T^O  00 
0  6  25 

+  .37     +.50 

/•    6  00  '/:   6  00 
0  6,37  ,0  6, ,50 

+  .62 

Z.   0  00 
0  6  62 
/•    6  12 
0  6  75 
z   6  25 
0  6  87- 

+  .75 
z   6  00 
0  6  75 
z    6  12 
0  6  87 
z    6  25 
0  7  00 

+  1.00 

z   6""00 
0  700 
z    6  12 
O7  12 
>  ..()  25 
0  7  25 

+  1.25, +  1.50 

z    li  00    z    6  00 
0  7  25  ,0  7  50 
z    6  12    z    6  12" 
0  7  37  ,0  7  62 

+  1.75 

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-CYLINDER  POWER 


—  Sphero 

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126 


B     A     V      S      C      II 


L     O     M      15 


OPTICAL 


r    O    M     P    A    X    Y 


ULTEX   ONEPIEGE   BIFOCAL  TABLE  OF 
SURFACING   TOOLS 

To  select  tool  r<'<|iiir(>(l  to  i::i'iii(l  flu-  unfiiiislici!  side  of  i)l;nik,  rcl'ci-  Id  +  O  +,  —  O  — ,  +  O 
—  or  —  O  +  section  of  tal)le,  as  may  he  necessary  accordin^j;  to  tlie  |)r<"s(rii)fion.  Truce  down 
column,  "Distance  Power,"  then  across  table  to  column  of  "('vMNnKK  Powek"  desired. 
The  bold  face  figure  in  the  intersecting^  sjiace  will  indicate  inner  curve  of  tlic  lilaiik  ami  tiic  less 
prominent  figure  the  ciu've  of  distance  ])ortion  of  toric  tool  re(|uirc(l. 

A  copy  of  this  tal)le,  printed  on  cardboard  for  shop  use,  will  l)c  mailed  fi-ee  on  request. 


CYLINDER  POWER 


+  SPHERO;  -.12 

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z   5  00 
0  700 

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0  8  75  1   0  8  75 

0  6  00      0  5  75 

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+  1.00  1 

/■   6  75 
0  7.00 

z    6  50  '    z    6  37 
0  7  00      0  7  00 

z   6  25 
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z    6  00 
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z    5  75 
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z   5  50 
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z    5  25 
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0  9  00 

jj  6.W 

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0  7  25 
z   7.00 
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6^21 

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z    5  25 
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z    5  25 
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z    5  75 
0  8  00 
z   6  00 
0  825 
z    0  25 
0  850 

0  6  7,1 
0  9  25 
z    5  00 
O75O 

C  6  SO 
O9  25 
0  6  75' 
0  9  50 

8  9  25 

+  1.50 

+  1.75 

A  '  25 

0  7  50 

z    6  75 
■    0  7  50 

z    6  50 
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z    600 
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+  2.00   j 

z  7  75 
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.z    6  75 
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z    6  00 
0  800 

z    5  50 

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z   5  25 
0  8  00 

z  5  00 

Osoo 

+  2.25 

z  8  00 
0  8.25 

z   7  75 
©8  25 

z   7  50 
0  8  25 

z    7  25 

0  8  25 

z    7  00 
0  825 

z    6  75 
0  825 

z    6  50 
0  8  25 
z    6  75 
0  8  50 

z    6  25 
0  8  25 
z    6  50 
0  8  50 

z    5  75 

0  8  25 

0825 

0  8  25 

+  2.50 

J  6.25 
4  6.50 

z  800 
0  8.50 

z   7  75 
0  850 
z  8  do 

0  8  75 

z    7  50 

0  8  50 

z    7  25 
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z    7  00 
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z    6  00 
0  8  50 

0  850 

0  850 

+  2.75 

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4  6  75 

^625 
4  6  75 

z    7  75 
0  8  75 

z   7  50 

0  8  75 

z   7  25 
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z    7  00 

0  8  75 

z    6  75 
0  8  75 

z    6  50 
0  8  75 
z    6  75 
0  9  00 

z    6  25 
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z    6  50 
0  9  00 

0  8  75 

0  8  75 

+  3.00 

4  7  00 

4  6  50 
4  700 

A  625 
4  7  00 

z    8  00 
0  9  00 

z    7  75 
0  9  00 

z   7  50 

0  9  00 

z    7  25 

0  9  00 

z  7  00 
0  9  00 

0  9  00  1    0  9  00 

+  3.25 

A  "» 
4  7.25 

A  8  " 
4  7  25 

4  7.50 

A  S™ 

4  7  25 

^625 
4725 

4  750 

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4  7  75 

z    8  00 
0  9  25 

z    7  75 
0925 

z    7  .50 

0  9  25 

z    7  25  1    z   7  00 
0  9  25  !    0  9  25 

0  9  25 

0  9  25  1    0  9  25 

+  3.50 

^  7  25 
4  7.50 

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4  750 
\.  7  00" 
4  7  75 

V.'U 

z  8  00 
0  9  50 

z    7  75 

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0  9  50  1    0  9  SO 

+  3.75 

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4  7  75 

A  '  25 
4  7  75 

4??^ 

4  6  25 
4  7  75 

z    8  00 
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z    7  75 
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0  9  75 
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lb  9  it 
1    z   7  00 
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A  650 

4800 

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4800 

OlO  00 

OlO  00 

OlO  00 

+  CYLINDER  POWER 


-    .12 


-   .25 


.37 


-   .50 


-   .62 


.75 


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1.50 


-1.75 


-2.00 


-2.25 


-2.50 


•+.25  1    +.37 


-2.75     8; 


3.00     8i 


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4.00 


9ii 


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625 
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9 '5  50 
6  25 
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V  5  75 


A  5  25 
0  6  25 

6  5  00 
600 


+  1.25    +1.50     +1.75     +2.00     +2.25 


65  , 
7( 


6  5 : 
7  : 


6  s  23 
6  75 
6  5  00 
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7! 


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7  SO      87; 


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6  5  75 
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7: 


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8! 

ft  5  "5 

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6  5  75 
850 


8  5 ; 
7 ; 


95  7a 
800 
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V  7  75 

9  5  25  I    Q  5  25 
7  25      V  7  50 

95'  00      o  5  00 

7  00  I    V  7  25 


6  5  25 
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6.5  00 
7  50 
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8  0  00 
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8  5  50 
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8  5' 25 
7  75 

8  5'6o 
7^50 

Q  5  50 

7  8  00 

9  5  00 1 
7  50  1 


6  5  25 
8  00 

6  5  00 
7  75 


o  6  25 

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8  6  00' 

8  8  .50 

'O  5  -50 


A  5  26 

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0  S  00 


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9i^ 


9?; 


127 


B     A     U      S     C      H 


L     O     AI     B 


OPTICAL 


COMPANY 


ULTEX  ONEPIECE   BIFOCAL  DIRECTIONS 

ONEPiECE  Bifocal  Lenses  being  made  of  one  ])iece  of  glass,  strain  due 
to  unov(Mi  expansion  is  eliminated  and  the  possibility  of  breakage  in 
grinding  is  reduced  to  a  minimum.  With  strong  addition,  these  lenses 
can  be  ground  extremely  thin  and  entirely  free  from  color,  or  chromatic 
aberration. 

Our  blanks  are  regularly  made  in  the  following  sizes: 

B  47  mm  round,  with  reading  portion  19  mm  round. 

E  49  X  '38  mm,  with  reading  portion  30  x  about  15  mm. 

E  Large  55  x  47  mm,  with  reading  portion  30  x  about  33  mm. 
They  are  made  in  the  deep  curvcfl  form  only  and  finished  on  the  concave 
side. 

Cylinders  must  be  ground  in  convex  toric.     If  cylinder  is  concave,  transpose 
to  convex. 

When  ordering  blanks  it  is  necessary  to  prefix  the  number  of  the  blank  by 
the  designation  "B,"  "E,"  or  "E  Large"  to  indicate  size  desired. 


128 


B     A     U      S      C      H  &  L      O      M      H        /C$i!S^        <^     V    T    I     C     A     h  C    O    M     I'    A     X    Y 


To  select  blank  lUHMJed,  refer  lo  cliarl.  trace  down  the  coluinn,  "Spliero 
Distance  Power,"  to  the  line  indicating  the  distance  j)ower  called  for;  then 
across  the  chart  to  the  re(]nired  readini;-  addition;  the  figure  in  the  intersecling 
space  will  show  the  nnniher  of  hlank  to  he  used. 

TooJ.s- — Onepiece  Bifocal  Lenses  will  focus  accurately  when  surface  grovnid 
on  convex  side  with  tools  of  B.  &:  T^.  index,  which  inusi  Ix'  ke])t  true  to  curve. 

Laying  Out — Place  on  Protractor  and  dot  around  dividing  line  with  red  or 
while  marking  ink.  Locate  and  dot  the  desired  optical  center  of  the  distance 
portion.  Inset  as  re(]uired  by  rotating  the  reading  portion,  using  the  o})tical 
center  of  the  distance  portion  as  a  center  of  rotation.  Rotate  to  the  right  or 
left  as  inset  is  required,  five  degrees  for  each  millimeter  of  inset.  If  cylinder 
is  to  be  added,  dot  the  axis.  An  allowance  of  L5  mm  above  the  dividing 
line  is  recommended  for  center  of  distance  portion,  all  of  our  blanks  being  cut 
to  this  allowance.  Protractors  for  laying  out,  surfacing  and  edging  blanks 
furnished  on  request. 

Marking — Locate  and  mark  measuring  points  equidistant  from  center,  as 
indicated  on  protractor.  When  marked,  chipping  before  surfacing  is  unneces- 
sary. If  prisms  are  required,  lay  outline  for  direction  of  prisms  and  measure 
thickness  on  this  line. 

Blocking — Use  B.  &  L.  iron  bodies,  47  mm  diameter,  and  B.  &  L.  pitch. 
Pitch  should  be  of  uniform  thickness,  not  less  than  3  mm  between  lens 
and  body.     Heat  slowly  and  evenly  to  avoid  over-heating. 

Roughing — Rough  the  blank  to  the  required  thickness  with  B.  &  L.  roughing 
emery,  allowing  i).'i  millimeter  for  smoothing,  and  measure  thickness  at 
markings  frecjuently  to  avoid  grinding  prismatically.  If  opposite  points 
measure  alike,  optical  center  will  be  in  correct  position.  Do  not  measure 
on  the  reading  portion,  as  lens  is  thicker  at  this  part.  It  is  necessary  to  use 
B.  &  L.  smoothing  emery  for  second  grinding  l)efore  using  the  finishing 
emery.  B.  &  L.  extra  fine  finishing  emery  is  for  high  finish  only  and  is  not 
intended  to  remove  stock. 

roIi.sliing—Vse  B.  &  L.  best  quality  thin  polishing  felt  and  B.  &  L.  wet 
ground  polishing  compound  (Rouge). 


129 


n   A   IT    s    c    n        &        L    o    M    n     /^&\      optical        company 


EYEGLASS    FRAMES,   MAGNIFIERS    AND 
READERS 

THE  niaiuifacture  of  Eyeglass  Frames  of  I)lack  and  shell-colored  zylonite 
dates  back  to  the  very  early  days  of  our  business.  Coupled  with  the 
interyening  years  of  experience  and  the  fact  that  this  material  lends 
itself  so  admirably  to  optical  requirements,  our  product  has  been  accepted  in 
both  American  and  European  markets  as  the  quality  standard. 

Magnifiers  ^vere  among  our  earliest  products.  They  are  the  result  of  many 
years  of  deyeloj^ment  and  are  suitable  for  a  great  yariety  of  purposes.  They 
are  yery  generally  used  in  school  ^york  by  natiu'alists,  inspectors  of  cloth  and 
other  articles,  seedsmen,  fruit  growers,  nurserymen,  detectiyes,  and  in  many 
other  yocations. 

Rubber  Magnifiers  are  made  in  oyal  and  bellows  shape,  with  one,  two  and 
three  lenses,  allowing  a  considerable  range  of  magnifications.  The  best 
quality  of  yulcanized  rubber  is  used  in  the  mounting,  giving  durability  com- 
bined with  light  weight  and  neat  appearance. 

The  Nickeled  Magnifiers  differ  from  the  preceding  chiefly  in  mounting. 
They  are  attractiyely  nickeled  and  furnished  only  in  the  bellows  sha{)e.  The 
rim  is  drawn  securely  about  the  lens  l)y  a  ball  joint,  which  serves  also  as  a 
means  of  opening  the  magnifier. 

The  Doublet  Magnifiers  also  have  nickel  metal  mounting.  They  consist 
of  two  separated  plano-conyex  lenses  and  are  ground  and  polished  to  give 
satisfactory  results  for  medium  power  magnifications.  Lenses  of  this  type 
are  fretjuently  oftVred  under  the  name  of  Coddington  Magnifiers,  but  they 
are  not  of  that  construction. 

Coddington  Magnifiers  give  a  good  definition  and  a  wide  field.  They  are 
composed  of  a  cylinder  of  glass  with  a  deep  grooye  cut  in  at  an  ecpuil  distance 
from  the  ends  to  serve  as  a  diaphragm.  The  ends  of  this  cylinder  are  ground 
spherically  and  polished  to  form  the  lens  surfaces. 

Triple  Aplanats  are  composed  of  two  meniscus  lenses  of  flint  glass,  sepa- 
rated by  a  double  conyex  lens  of  crown  glass.  The  field  of  these  magnifiers 
is  large  and  has  a  perfect  correction  for  chromatic  aberration  as  well  as  for 
flatness,  astigmatism  and  distortion.  Their  working  distance  is  little  short 
of  a  simple  lens  of  the  same  ecpiiyalent  focal  length. 

Hastings  Aplanatic  Triplet  Magnifiers  are  made  after  fornuike  by  Prof. 
Hastings,  of  the  SheflSeld  School,  Yale  Uniyersity.  They  are  among  the 
most  perfect  magnifiers  produced,  with  a  high  correction  always  api)reciated 
by  scientists.  The  angle  of  yiew  embraced  is  \er\  large  and  the  working 
distance  almost  equal  to  that  of  a  single  lens  of  the  same  focus. 

130 


OPTICAL  ("    O    M     1'    A    X    Y 


Watchmakers'  Glasses  arc  used  in  Ihc  Iradcs  and  arc  also  |)()|)ulai-  with 
botany  and  zoology  slndcnls.  \Vliil<>  all  arc  easily  lu-ld  in  llic  orhil  of  Ihc  eve, 
leaving  die  hands  freefone  style  (No.  114  L.  P.)  is  made  wilh  a  delaciiahle 
sprino-  to  pass  around  the  head  and  hold  the  glass  in  |)()sition  for  more  extended 
observations.  Another  (No.  144  A)  is  fitted  wilh  Iwo  lenses,  one  of  which  is 
removable,  giving  two  different  foci  and  magnifications.  All  styles  have 
vulcanized  rubber  mountings,  with  black  or  ivory  finish. 

Engravers'  Glasses  are  designed  particularly  for  engravers,  carvers  and 
die  cutters.  Their  large  clear  field,  however,  renders  them  valuable  for  large 
dissections  in  biological  work,  for  retouching  and  for  use  as  condensers.  All 
styles  are  furnishetl  in  vulcanite  mountings. 

Bank  Note  Detectors  are  specially  designed  for  government  and  bank 
officials  for  the  examination  of  currency,  signatures,  etc.,  but  they  can  be 
used  to  good  advantage  wherever  a  perfectly  corrected  magnifier  is  required. 
The  lenses  are  achromatic,  give  a  large  clear  field  and  high  magnifications. 

Too  much  emphasis  can  scarcely  be  laid  upon  the  (juality  of  our  Reading 
Glasses.  They  are  unsurpassed,  Ave  believe,  in  optical  properties,  design  and 
workmanship.  The  lenses  are  accurately  ground  of  clear  white  optical  glass 
and  highly  polished.  While  giving  comparatively  low  magnifications,  they 
cover  a  wide  field.  We  offer  three  styles  of  rims  and  handles:  Nickeled  rim 
and  ferrule  Avith  ebonized  wood  handle,  nickeled  rim  with  ivory-finished  ferrule 
and  handle  and  ivory-finished  throughout. 

The  rims  are  of  sufficient  width  to  protect  the  lens  surfaces.  We  apply  a 
special  ])rocess  for  attaching  the  ferrules  to  the  handles,  which  renders  it 
impossible  for  them  to  work  loose.  The  handles  are  securely  screwed  to  the 
rims,  being  thus  easily  removable  though  strongly  attached. 

Semi- Achromatic  Reading  Glasses  are  offered  for  those  desiring  readers 
of  a  l)etter  correction  than  is  afforded  by  a  single  lens.  They  are  made  of  two 
plano-convex  lenses,  corrected  to  eliminate  chromatic  and  spherical  aberration 
to  a  certain  extent.    Thev  are  furnished  with  nickel  rim  and  ebonized  handle. 

Our  Reducing  Glasses  consist  of  double  concave  lenses  of  the  same  quality 
as  our  readers  and  are  made  in  nickel  rim  with  ebonized  handles.  They  are 
used  by  artists  and  engravers  to  reduce  drawings,  photographs,  etc. 

A  general  demand  has  ai-isen  for  a  convenient  stand  to  hold  reading  glasses 
of  different  diameters.  Our  Reading  Glass  Holder  has  been  designed  for  this 
purpose  and  is  most  effective  in  disj)laying  our  line.  It  will  hold  six  readers, 
from  ^  to  6  inches  in  diameter,  and  for  a  display  article  is  most  attractive. 

We  have  constructed  two  forms  of  Magnifier  Holders.  While  they  are 
designed  especially  for  use  in  dissections,  they  are  equally  valuable  wherever 
it  is  desirable  to  use  a  magnifier,  with  the  hands  free.     (See  page  146.) 

131 


EYEGLASS    FRAMES 


B     A     U      .S     C      II 


L     O     M      B 


OPTICAL 


C    O    M     I'    A    X    ^ 


EYEGLASS   FRAMES 

THESE  Eyeglas.s  Franuvs  arc  made  in  black  and  shell  colored  Zylonite 
of  an  extra  fine  fini.sh  wilh  ad ju.stahle  cork  j^uards.     They  are  recom- 
mended where  the  elimination  of  glarini--  reflection  effect.s  of  the  edges 
is  desired.     They  are  supplied  in  1,  0  and  00  eye  sizes. 

Black  Frames  are  regularly  supplied  with  blue  springs,  and  shell  colored 
frames  with  bronze  springs. 


Style 

No. 


1'2 
12  O 

12  X 

12  XO 

12  Z 
12  ZO 

12  XZ 
12  XZO 


Frames 


Black  Zylonite,  with  handle,  adjustable  cork  guard 
Black  Zylonite,  with  handle,  adjustable  cork  offset 

guard    

Black  Zylonite,  no  handle,  ailjvi.stable  cork  guard 
Black  Zylonite,  no  handle,  adjustable  cork  offset 

guaril 

Shell  Zylonite,  witli  handle,  adjustable  cork  guard 
Shell  Zylonite,  with  handle,  adju.stable  cork  offset 

guard    

Shell  Zylonite,  no  handle,  adju.stable  cork  guard 
Shell  Zylonite,  no  handle,  adjustable  cork  offset 

guard    


Per  Dozen 

1  Eye 

0  Eye 

00  Eye 

$3.00 

$3.25 

$3.50 

3.00 

3.25 

3.50 

3 .  00 

3.25 

3.50 

3.00 

3.25 

3.50 

3 .  00 

3.25 

3.50 

3.00 

3.25 

3.50 

3.00 

3.25 

3.50 

3.00 

3.25 

3.50 

EYEGLASS  MATERIAL 


Style 

Material 

Per  Dozen 

!   Style 
No. 

No. 

lEye 

OEye 

00  Eye 

12 

Handles 

$1.50 

$1 .  GO 

$1.75 

12 

12  X 

Handles 

1..50 

1.60 

1.75 

12 

12  Z 

Handles 

1.50 

1.60 

1.75 

il2  O 

12  XZ 

Handles 

1.50 

1.60 

1.75 

12 

12 

Left 

1.25 

1.35 

1.50 

12  O 

12  X 

Left 

1.25 

1.35 

1 .  50 

12 

12  Z 

Left 

1.25 

1.35 

1.50 

jl2 

12  XZ 

Left 

1.25 

1.35 

1.50 

i 
1 

Material 


Springs,  blue  or  bronze     .    .    . 

Guards,  cork 

Guards,  offset 

Hangers,  blue  or  bronze  .    .    . 
Hangers,  blue  or  bronze  offset 

Screws,  blue,  long      

Screws,  blue,  short 

Catch  Pins 


Per 
Dozen 


1.15 
.40 
.40 
.10 
.10 
.10 
.10 
.15 


133 


EYEGLASS   FRAMES   AND  MONOCLES 


NO.  40-40  Z 


134 


T5     A     U      S      C      II 


L     O      M      B 


<)     I'    'I'    I     ('    .\    L 


(•    O    M     I'    .\    .N    Y 


EYEGLASS   FRAMES   AND   MATERIAL 

TiiKSK  Frames  aiv  made  to  mvv[   the  (UMiiand  for  a  simplified  form  of 
eyeji;lass.     "^riic  frames  are  of  ^ood  finish,  and  the  eomjjlctc  eyc^las.se.s 
are  mounted    with    double    convex    lenses.     No.   21   has   rij^id    <fuard, 
No.  31^2  lias  cork  guard;  both  are  made  in  one  eye  size  only.   (Seepage  134.) 


Catalog 

Per  Dozen 

No. 

Eyeglasses 

Frames 

Handles 

Lefts 

Springs 

$0.15 
.25 

Guard.s 

21 

3H 

Bhick  Zylonitc   .    . 
Blacli  Zylonite  .    . 

$2 .  00 
2.75 

$1.50 
2.25 

$1.00 
1.25 

$0 .  75 
1.00 

$0.15 

MONOCLE    GLASSES 

(For  illustration  see  page  134) 


Catalog 
No. 

Old 

Catalog 

No. 

Description 

Per  Dozen 

Frames 

Fitted  with 
Piano  Lenses 

40 
41 

42 

40 

40  Z 
40 

Black  Zylonite,  Small  riii<!;  handle  .... 
Shell  Zylonite,  Small  ring  handle    .... 
Rimless     ...                                         ... 

$1.50 
1.50 

$2.25 
2.25 
1.00 

EYEGLASS    HOOKS 


Catalog 
No. 


Description 


Per  Dozen 


Black  Zylonite,  Small  Size 
Black  Zylonite,  Lar<i;e  Size 
Shell  Zylonite,  Small  Size 
Shell  Zylonite,  Large  Size 


$1.25 
1.50 
1 .  25 
1.50 


135 


FOLDING    MAGNIFIERS 
HARD    RUBBER    AND     Z-TLONITE     MOUNTINGS 


NO.  lOl-JlS 


NO.  102  -120 


136 


A     U      S     C      II  &  L     O     M      H      /^^^\       OPTIC    A    L  CO    M     1'    A    .\    Y 


FOLDING   MAGNIFIERS 

HARD   RUBBER  AND   ZYLONITE   MOUNTINGS 


Catalog  No. 

Code 

Shape 

Diameter 
in  mm 

Magnification 

X 

5.0 

Price  Per 
Dozen 

50 

Lass 

Oval 

20 

$3.00 

56 

Labor 

Oval 

25 

4.0 

3.75 

62 

Lacerta 

Oval 

30 

3  5 

5.00 

68 

Lackey 

Oval 

37 

3.0 

6.00 

74 

Lactant 

Oval 

44 

2.5 

7.50 

78 

Lactone 

Oval 

50 

2.0 

9.00 

51 

Lab 

Oval 

15  and  20 

5.0  to  10 

4.50 

57 

Lace 

Oval 

20  and  25 

0.4  to  8 

6.00 

63 

Lacing 

Oval 

25  and  30 

3.5  to  7 

7 .  50 

69 

Lactage 

Oval 

30  and  37 

3.0  to  6 

9 .  00 

75 

Lactine 

Oval 

37  and  U 

2 . 5  to  5 

12.00 

79 

Lactyl 

Oval 

44  and  50 

2.0  to  4 

15.00 

56  Z  1 

Langral 

Oval 

25 

4.0 

4 .  50 

62  Z  I 

Language 

Oval 

30 

3.5 

6.00 

101 

Lacuna 

Bellows 

18 

6.0 

3.00 

110 

Ladkin 

Bellows 

20 

5.0 

3 .  50 

119 

Lagena 

Bellows 

25 

4.0 

4.00 

102 

Lad 

Bellows 

15  and  18 

6  to  12 

4.50 

111 

Ladrone 

Bellows 

18  and  20 

5  to  10 

5.25 

120 

Lagoon 

Bellows 

20  and  25 

4  to  8 

6.00 

103 

Lading 

Bellows 

12,  15  and  18 

6  to  20 

6.00 

112 

Laft 

Bellows 

15,  18  and  20 

5  to  15 

7.50 

121 

Laical 

Bellows 

18,  20  and  25 

4  to  10 

9.00 

NICKELED    METAL  MOUNTINGS 

(For  illustrations  see  page  138) 


101  NK 

Lama 

'     Bellows 

20 

5.0 

$4.50 

110  NK 

Laminar 

Bellows 

25 

4.0 

5.00 

119  NK 

Lander 

Bellows 

30 

3.5 

5.50 

102  NK 

Lambda 

Bellows 

20 

5  to  10 

6.00 

111  NK 

Lampate 

Bellows 

25 

4  to    8 

6.75 

120  NK 

Lang 

Bellows 

30 

3  to    6 

7.50 

103  NK 

Lames 

Bellows 

20 

4  to  16 

9.00 

112  NK 

Lance 

Bellows 

25 

3  to  12 

10.50 

121  NK 

Langate 

Bellows 

30 

2  to    8 

12.00 

137 


FOLDING  MAGNIFIERS 

NICKELED   METAL   MOUNTINGS 


IF=1 


NO,   101   NK  -1  19NK 


NO.  102  NK  -120  MK 


NO.  103  NK     IZl  MK 


DOUBLETS 


CODDINGTONS  AND   TRIPLETS 


J]  a 


:^ 


NO.  160-I63 


NO.  165-168 


Na  I70-I73         K 


138 


B     A     U      S     C      H  &  L     O     M      B       /<^@\        OPTICAL  CO    M     1'    A     N    Y 


HAND   MAGNIFIERS 

DOUBLETS 


Catalog  No. 

Old 

Catalog  No. 

Code 

Diameter  in 
mm 

Magnification 

X 

Price  Per 
Dozen 

136 
137 

6 

7 

Laticlavc 
Latimer 

12 

10 
10 

$7.50 
9.00 

CODDINGTONS 


160 

Land 

12 

20 

13. 50 

161 

I^auiice 

15 

15 

15.00 

102 

Launder 

20 

10 

16.50 

163 

Lam-ate 

25 

5 

18.00 

TRIPLE   APLANATS 


165 

Lamel 

10 

20 

45.00 

166 

Laurus 

12 

15 

45.00 

167 

Laveiet 

15 

10 

45.00 

168 

Laveer 

20 

8 

45.00 

HASTINGS   APLANATIC   TRIPLETS 


170 

Lawnd 

7 

20 

90.00 

171 

Laxitv 

10 

15 

90.00 

172 

La^•er 

12 

10 

90.00 

173 

Lazar 

15 

7 

90.00 

BANK   NOTE   DETECTORS 

(For  illustration  see  page  140) 


180 

La/aret 

25 

10 

90.00 

181 

Laze 

30 

8 

86.00 

182 

Lazily 

35 

6 

82.00 

183 

Lazy 

40 

5 

78.00 

139 


B     A     U      S     C      !I  A  LOME       /^^^^        OPTICAL 


COM     P    A    N    Y 


WATCHMAKERS'  AND  ENGRAVERS'  GLASSES 


NO.    lao  NO.    183 

BANK   NOTE  DETECTOR 


140 


L     O     M     n 


OPTICAL 


<'     O     M     1'    A     N     V 


WATCHMAKERS'  AND   ENGRAVERS'  GLASSES 


Our  Watcliinakers'  (jlassos  air  I'liniislR-cl  in  citlicr  hlark  or  wliitc  ivoiv  lirii>li. 
'I,"  added  to  the  catalog  numbers  below,  indicativs  tlie  ivory  finish. 


'I'hr    Icll. 


Catalog  No. 

Code 

Diameter  in  mm 

Magnification  >: 

Price  Per  Dozen 

144-2 

Lapis 

25 

7  to  10 

$4 .  50 

144-2 

LapHng 

25 

3  to  5 

3.00 

144-^2 

Lapp  ; 

25 

2  to  3 

2 .  75 

144-3 

Larch 

30 

3  to  5 

3.50 

144-3 

Lard 

30 

2  to  3 

3.00 

144-2  I 

Larderer 

25 

7  to  10 

5.25 

144-2  I 

Lardery 

25 

3  to  5 

3.75 

144-2  I 

Lardoon 

25 

2  to  3 

3.50 

144-3  I 

Larch-y 

30 

3  to  5 

4.25 

144-3  I 

Lare 

30 

2  to  3 

3.75 

144^ 

Layiat 

12 

10 

3.50 

144i  I 

Laying 

12 

10 

4.25 

144  a 

Larget 

12  and  25 

4  and  7 

5 .  25 

144a  I 

Largish 

12  and  25 

4  and  7 

0.00 

144-2  LP 

Lippet 

25 

3  to  5 

4.50 

144-2  LP 

Lappic 

25 

2  to  3 

4  25 

144-3  LP 

Larder 

30 

3  to  5 

5.00 

144-3  LP 

Lardon 

30 

2  to  3 

4.50 

144-2  LPI 

Largo 

25 

3  to  5 

5.25 

144-2  LPI 

Lariat 

25 

2  to  3 

5.00 

144-3  LPI 

Larine 

30 

3  to  5 

5.75 

144-3  LPI 

I^ark 

30 

2  to  3 

5.25 

ENGRAVERS'  GLASSES 


146 

Larva 

40 

3.5 

13.50 

148 

Lascious 

50 

2.5 

18.00 

146a 

Lasket 

40 

3.5 

0.75 

148a 

Latchet 

50 

2.5 

9.00 

141 


15     A     U      sen  &  L     O     M      B       /i^^        OPTICAL  COMPANY 


READING   GLASSES 


142 


B     A     V      S      C      II 


h      O      M      I! 


OPTIC     A     1, 


<•    O     M     1'    A     X     Y 


READING   GLASSES 

Our  readers  are  of  the  best  quality  of  material  mid  workiiiaiisliip.  'I'hc  lenses  are  double 
convex,  accurately  ground  from  clear  white  glass  and  highly  polished.  'Hieir  ningiiificatioiis 
are  calculated  to  give  the  clearest  possible  field  for  their  resjiective  diameters. 

We  make  three  styles  as  follows:  Nickel  rim  and  ferrule  with  black  handle,  nickel  rim  with 
ivory  finish  ferrule  and  handle  (I.  II.),  and  of  ivory  finish  throughout  —  rim,  ferrule  and  handle  (I). 


Catalog  No. 

Code 

Lens  Diameter 

Focus 

5  inclies 

Price  Per  Dozen 

200 

Legume 

2    inches 

U.')() 

202 

Leipoa 

2^  inclies 

6  inches 

5.75 

204 

Leister 

3    inches 

7  inches 

6.75 

206 

Leman 

3^  inches 

8  inches 

9.00 

208 

Lennna 

4     inches 

10  inches 

12.00 

209 

Lemiu' 

4^  inches 

12  inches 

15.00 

210 

Lena 

.'}     inches 

13  inches 

18,00 

211 

Lenitive 

.5  J  inches 

14  inches 

22.50 

212 

Lentical 

0    inches 

15  inches 

27.00 

200  IH 

Lere 

2     inches 

5  inches 

5.00 

202  IH 

Lered 

2J  inches 

6  inches 

6.25 

204  IH 

Lerot 

3     inches 

7  inches 

7.50 

206  IH 

Les 

3J  inches 

8  inches 

10.50 

208  IH 

Lesion 

4     inches 

10  inches 

13.50 

209  IH 

Lest 

4^  inches 

12  inches 

17.00 

210  IH 

Let 

5     inches 

13  inches 

20.25 

211  IH 

Letch 

.5^  inches 

14  inches 

25.25 

212  IH 

Lethe 

6    inches 

15  inches 

30.00 

200  I 

Lethy 

2    inches 

5  inches 

5.75 

202  I 

Letofl" 

2^  inches 

G  inches 

7.50 

204  I 

Letter 

3    inches 

7  inches 

9.00 

206  I 

Levite 

3J  inches 

8  inches 

12.50 

208  I 

Lettish 

4     inches 

10  inches 

10.50 

209  I 

Letts 

4j  inches 

12  inches 

20.75 

210  I 

Lettuce 

5    inches 

13  inches 

24.75 

211  I 

Letup 

.51  inches 

14  inches 

30.50 

212  I 

Level 

0    inches 

15  inches 

36.00 

143 


HAT'    s    r 


H  /c  L     O     M     B       /^i^       OPTICAL  COMPANY 


READING    AND    REDUCING    GLASSES 


Semi-Achromatic  readers  have  two  plano-convex  lenses,  instead  of  the 
single  double  convex  lens.    This  affords  better  correction  and  eliminates 
chromatic  and  spherical  al)erration  to  a  certain  extent. 
Our  Reducing  Glasses  consist  of  double  concave  lenses.     They  are  used 
by  artists  and  engravers  to  reduce  drawings,  photographs  and  other  illustra- 
tions. 

Semi-Achromatic  readers  and  reducing  glasses  are  made  in  one  style  of 
finish  only,  nickel  rim  and  ferrule  with  black  handle. 


Catalog 
No. 

Code 

Description 

Lens 
Diameter 

Focus 

Price  Per 
Dozen 

Reading  Glasses,  Semi- 
Achromatic 

200  A 

Lentigo 

2  Plano-Cx.  Lenses 

2    inches 

5  inches 

$  9.00 

202  A 

Lentoiil 

2  Plano-Cx.  Lenses 

2i  inches 

6  inches 

11.25 

204  A 

Lcpal 

2  Plano-Cx.  Lenses 

3    inches 

7  inches 

13.50 

206  A 

Lepid 

2  Plano-Cx.  Lenses 

3J  inches 

8  inches 

18.00 

208  A 

Lepra 

2  Plano-Cx.  Lenses 
Reducing  Glasses 

4    inches 

10  inches 

22.50 

200  cc 

Leful 

Double  Cc.  Lenses 

2    inches 

5  inches 

6.00 

202  cc 

Legate 

Double  Cc.  Lenses 

2^  inches 

6  inches 

7.50 

204  cc 

Leger 

Double  Cc.  Lenses 

3    inches 

7  inches 

9.00 

206  cc 

Legion 

Double  Cc.  Lenses 

3^  inches 

8  inches 

12.00 

208  cc 

Legist 

Double  Cc.  Lenses 

4    inches 

10  inches 

15.00 

144 


Reading  Glass  Holder,  No.  "IW 


Reading  Glass  Holder,  No.  240-1 


Magnieier  Holder,  TU 


Magnifier  Holder,  TUS 


145 


B      A     IT       S      C      II 


L     O     M      B       /C5!£«°?\        O     P    T    I    r    ,\    L  ("    O    M     P    A    N    Y 


READING    GLASS    HOLDER 


(For  illustrations  see  pagre  145) 

Catalog: 
No. 

Code 

Description 

Price 
Per  Dozen 

240 
240  I 

Leptus 
Latcliing 

Black  P2bonized  Wooden  Base  with  holes  for  Six  Readers 
Ivory  Finish  Base  with  holes  for  Six  Readers      .... 

$9.00 
9.00 

MAGNIFIER    HOLDERS 

(For  illustrations  see  page  145) 

WE  offer  two  stands  differing  in  their  scope  and  adjustment.  The  TU 
has  a  metal  base,  98  mm  in  diameter,  and  height  of  ITS  mm.  The 
lens  arm  is  of  one  piece  with  spring  clamp  at  end,  which  will  hold 
any  lens  not  more  than  38  mm  in  diameter,  with  vertical  and  lateral  adjust- 
ments. The  TUS  has  a  base  of  heavy  metal,  I'i'i  mm  diameter,  with  a  round 
metal  pillar  measuring  95  mm  from  top  to  base.  The  lens  arm  is  in  three 
parts,  with  three  joints,  attached  to  a  triangular  post  by  a  strong  joint  with 
broad  bearing  surface.  The  spring  clamp  will  hold  lenses  not  exceeding 
38  mm  in  diameter.     Adjustment  is  by  rack  and  pinion. 


Catalog 
No. 


TU 

TUS 


Code 


Avel 
Avena 


Description 


Adjustable  Stand 
Adjustable  Stand 


Price 
Each 


$3.00 
9.00 


TRADE    MARK    FINDER 

(For  illustration  see  page  145) 

THIS  magnifier  was  especially  designed,  as  its  name  implies,  to  facilitate 
the  finding  of  our  trade  mark,  which  is  engraved  on  several  of  our  high- 
grade  len.ses  and  of  which  mention  is  made  in  the  preceding  pages.  All 
optometrists  and  opticians,  who  use  our  Ultex  Onepiece  Bifocal  and  Punktal 
lenses,  should  have  one,  as  it  enables  them  to  verify  our  })roduct.  One  end  of 
the  finder  is  arranged  to  hold  the  lens  securely  in  place  while  under  observation. 


Catalog 
No. 

Code 

Description 

Price 
Each 

245 

Latchkey 

Ivory  Finish  Mounting 

$2.50 

146 


B     A     U      S     C      II  &  L     O     M      «       /MS&\        O     I'    T    I    C    A     L  <'    O    M     I'    A    X    Y 


CO-OPERATIVE   SERVICE 

OUR  Scientific  Bureau  and  Advertisini;-  Dej)arlinenl  are  al  tiie  constant 
service  of  our  patrons  for  educational  and  publicity  purposes.  Various 
})ieces  of  literature,  of  a  technical  or  advertising  value,  are  frequently 
published  for  the  benefit  of  those  oculists,  optometrists  and  opticians  who 
request  them. 

To  render  the  truest  service  and  sell  the  highest  grade  goods  it  is  necessary 
to  educate  the  public  to  the  real  advantages  of  such  goods.  That  is  the  aim 
of  our  co-operative  advertising  service.  Our  different  folders  and  signs  are 
scientifically  correct  in  copy  and  illustration,  yet  simple  and  interesting  enough 
to  convince  the  average  layman.  They  are  furnished  in  reasonable  quantities 
free  of  charge — the  folders  and  booklets  imprinted  with  the  business  card  of 
the  individual  optometrist  or  optician  re({uesting  them,  and  of  a  convenient 
size  for  enclosing  in  the  ordinary  letter  envelope. 

SCIENTIFIC   AND  TECHNICAL  PUBLICATIONS 

Pamplilet  No.  1.    "The  Eye  aiul  the  Jjens." 

Pamplilet  No.  i.    "The  Substitution  of  Meniscus  for  Flat  Ophthahnic  Lenses  and  a  New  System 

of  Designating  tlieir  Powers." 
Pamphlet  No.  3.    "Location  of  the  Oplithahiiic  Lens  before  the  Eye  and  Its  Correcting  Power." 
I^amphlet  No.  4.    "Large  Gullstrand  Ophthalmoscope  with  Electric  Illumination  for  the  Exami- 
nation of  the  Fundus  Oculi  witli  Stereoscojjic  Effect." 
Pamphlet  No.  5.    "Punktal  Lenses,  Their  Advantages  and  Apjjlication  to  Present  Day  Methods." 
Pamphlet  No.  6.    "The  Significance  of  Punktal  Lens  Principles  in  Application  to  the  Eye." 
Pamphlet  No.  7.    "Tlie  Vertex  Dioptrometer — Its  Principles  and  Usage." 

Pamphlet  No.  8.    "The  Keratometer,  Interpupillary  Distance  Gauge  and  Exophthalmometer." 
Pamphlet  No.  9.    "Spectrum  Projection  and  Its  Application  to  Ophthalmic  Practice." 
(Others  to  follow.) 

ADVERTISING  AIDS 

FOLDERS  CHARTS 

"Punktal  Lenses."  "Ophthalmic    Lens    Chart  —  Showing    Com- 

"Toric  and  Meniscus  Lenses."  parativc  Fields  of  Deep  Curved  and  Flat 

"Ultex  Onepiece  Bifocals."  Lenses.     (See  page  iU.)     (Wall  and  Desk 

"Kryptok  Bifocals."  Sizes.)" 

"Stereo  Prism  Binoculars."  DISPLAY    SIGNS 

"Reading  Glasses."  "Punktal  Lenses." 

"Magnifiers  and  Readers."  "Toric  and  Meniscus  Lenses   (^Yindow  and 

"  Watclimakers'  Glasses."  Counter  Sizes.)" 

„ ,„„„„  "Stereo  Prism  Binoculars." 

NEWSPAPER   ELECTROS 

"Kryptok  Bifocals."  BOOKLETS 

"Stereo  Prism  Binoculars."  "Stereo  Prism  Binoculars." 

(Others  to  Follow.)  "Magnifiers  and  Readers." 

147 


BATTSCII  &  LOME       /@!!£«5\        OPTICAL  COMPANY 


I 


OTHER    PUBLICATIONS 

N  addition  to  our  co-operative  service  already  outlined  we  issue  catalogs, 
booklets  and  circulars  on  the  following  products  of  our  manufacture: 


Microscopes  and  Accessories  Range   Finders   and    Gun   Sights   for 

Microtomes  Army  and  Navy 

Ophthalmic  Apparatus  Equatorial  Telescopes 

Photographic  Lenses  and  Shutters  Field  and  Opera  Glasses  (Stereo  Prism 

Projection    Apparatus.      (Balopticons  Binoculars) 

and  Accessories)  Magnifiers  and  Readers 

Photomicrographic  Apparatus  Centrifuges 

Engineering  Instruments.     (Transits,  Laboratory  Glassw^are 

Levels,  etc.)  Bacteriological  Apparatus 

Zeiss  Scientific  Instruments 

We  shall  be  glad  to  mail  any  of  this  literature  vipon  request.  To  dealers 
interested  in  promoting  the  sale  of  any  of  these  lines  we  are  also  prepared  to 
furnish  a  co-operative  service  in  the  form  of  imprinted  circular  matter  for 
distribution,  advertising  electros,  display  signs,  etc. 

The  following  instructive  publications  will  be  found  of  particular  value  to 
users  of  the  different  instruments  indicated  by  the  titles: 

Booklet — "Use  and  Care  of  the  IVlicroscope." 

Booklet — "Use  and  Care  of  the  Microtome." 

Booklet — "Useful  Tables  for  the  Photoi,frai>her." 

Booklet — "The  Microscoj)ical  Determination  of  the  Properties  of  Minerals." 

Manual — "Metro  Manual."     (For  lingineers.) 

Chart — Illustrating  Parts  of  Comjjound  Microscope  Diagramaticaily."     (Wall  Size.) 

Book — "Manipulation  of  the  Microscope,"  by  luhvard  Bausch.     Cloth  bound;  price,  .$1.00. 

All  of  these  publications,  except  the  last  named,  are  sent  free  upon  re(juest. 

PRESCRIPTION  BLANK 

Our  prescription  blank,  described  on  page  iO,  can  be  supplied,  if  desired, 
with  the  protractor  scale  graduated  to  the  American  Standard,  as  well  as  the 
International  Standard  illustrated  on  page  48. 


148 


